Comment faire ses mappings ElasticSearch aux petits oignons ? - LINAGORA

Indexation d’un annuaire de restaurant
● Titre
● Description
● Prix
● Adresse
● Type
2

Création d’un index sans mapping
PUT restaurant
{
"settings": {
"index": {
"number_of_shards": 3,
"number_of_replicas": 2
}
}
3

Indexation sans mapping
PUT restaurant/restaurant/1
{
"title": 42,
"description": "Un restaurant gastronomique où tout plat coûte 42 euros",
"price": 42,
"adresse": "10 rue de l'industrie, 31000 TOULOUSE",
"type": "gastronomie"
}
4

Risque de l’indexation sans mapping
PUT restaurant/restaurant/2
{
"title": "Pizza de l'ormeau",
"description": "Dans cette pizzeria on trouve
des pizzas très bonnes et très variés",
"price": 10,
"adresse": "1 place de l'ormeau, 31400
TOULOUSE",
"type": "italien"
}
{
"error": {
"root_cause": [
{
"type": "mapper_parsing_exception",
"reason": "failed to parse [title]"
}
],
"type": "mapper_parsing_exception",
"reason": "failed to parse [title]",
"caused_by": {
"type": "number_format_exception",
"reason": "For input string: "Pizza de
l'ormeau""
}
},
"status": 400
} 5

Mapping inféré
GET /restaurant/_mapping
{
"restaurant": {
"mappings": {
"restaurant": {
"properties": {
"adresse": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"description": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"prix": {
"type": "long"
},
"title": {
"type": "long"
},
"type": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
}
}
}
}
6

Création d’un mapping
PUT :url/restaurant
{
"settings": {
"index": {"number_of_shards": 3, "number_of_replicas": 2}
},
"mappings": {
"restaurant": {
"properties": {
"title": {"type": "text"},
"description": {"type": "text"},
"price": {"type": "integer"},
"adresse": {"type": "text"},
"type": { "type": "keyword"}
}
}
}
}
7

Indexation de quelques restaurants
POST :url/restaurant/restaurant/_bulk
{"index": {"_id": 1}}
{"title": 42, "description": "Un restaurant gastronomique où tout plat coûte 42 euros", "price": 42, "adresse":
"10 rue de l'industrie, 31000 TOULOUSE", "type": "gastronomie"}
{"index": {"_id": 2}}
{"title": "Pizza de l'ormeau", "description": "Dans cette pizzeria on trouve des pizzas très bonnes et très
variés", "price": 10, "adresse": "1 place de l'ormeau, 31400 TOULOUSE", "type": "italien"}
{"index": {"_id": 3}}
{"title": "Chez l'oncle chan", "description": "Restaurant asiatique très copieux", "price": 14, "adresse": "13
route de labège, 31400 TOULOUSE", "type": "asiatique"}
8

Recherche basique
GET :url/restaurant/_search
{
"query": {
"match": {
"description": "asiatique"
}
}
}
{
"hits": {
"total": 1,
"max_score": 0.6395861,
"hits": [
{
"_source": {
"title": "Chez l'oncle chan",
"description": "Restaurant asiatique très copieux pour un prix
contenu",
"price": 14,
"adresse": "13 route de labège, 31400 TOULOUSE",
"type": "asiatique"
}
}
]
}
}
9

Mise en défaut de notre mapping
GET :url/restaurant/_search
{
"query": {
"match": {
"description": "asiatiques"
}
}
}
{
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
10

Qu’est ce qu’un analyseur
● Transforme une chaîne de caractères en token
○ Ex: “Le chat est rouge” -> [“le”, “chat”, “est”, “rouge”]
● Les tokens permettent de construire un index inversé
11

Qu’est ce qu’un index inversé
12

Explication: analyseur par défaut
GET /_analyze
{
"analyzer": "standard",
"text": "Un restaurant asiatique très copieux"
}
{
"tokens": [{
"token": "un",
"start_offset": 0, "end_offset": 2,
"type": "<ALPHANUM>", "position": 0
},{
"token": "restaurant",
},{
"token": "asiatique",
},{
"token": "très",
},{
"token": "copieux",
}
]
}
13

Explication: analyseur “french”
GET /_analyze
{
"analyzer": "french",
"text": "Un restaurant asiatique très copieux"
}
{
"tokens": [
{
"token": "restaurant",
},{
"token": "asiat",
},{
"token": "trè",
},{
"token": "copieu",
}
]
} 14

Décomposition d’un analyseur
Elasticsearch décompose l’analyse en trois étapes:
● Filtrage des caractères (ex: suppression de balises html)
● Découpage en “token”
● Filtrage des tokens:
○ Suppression de token (mot vide de sens “un”, “le”, “la”)
○ Transformation (lemmatisation...)
○ Ajout de tokens (synonyme)
15

Décomposition de l’analyseur french
GET /_analyze
{
"tokenizer": "standard",
"filter": [
{
"type": "elision",
"articles_case": true,
"articles": [
"l", "m", "t", "qu", "n", "s", "j", "d", "c",
"jusqu", "quoiqu", "lorsqu", "puisqu"
]
}, {
"type": "stop", "stopwords": "_french_"
}, {
"type": "stemmer", "language": "french"
}
],
"text": "ce n'est qu'un restaurant asiatique très copieux"
}
“ce n’est qu’un restaurant asiatique très
copieux”
[“ce”, “n’est”, “qu’un”, “restaurant”, “asiatique”,
“très”, “copieux”]
[“ce”, “est”, “un”, “restaurant”, “asiatique”,
“très”, “copieux”]
[“restaurant”, “asiatique”, “très”, “copieux”]
[“restaurant”, “asiat”, “trè”, “copieu”]
elision
standard tokenizer
stopwords
french stemming
16

Spécification de l’analyseur dans le mapping
{
"settings": {
"index": {
"number_of_shards": 3,
"number_of_replicas": 2
}
},
"mappings": {
"restaurant": {
"properties": {
"title": {fields: {"type": "text", "analyzer": "french"}},
"description": {"type": "text", "analyzer": "french"},
"adresse": {"type": "text", "analyzer": "french"},
}
}
}
}
17

Recherche résiliente aux erreurs de frappe
GET /restaurant/restaurant/_search
{
"query": {
"match": {
"description": "asiatuques"
}
}
}
{
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
18

Une solution le ngram token filter
GET /_analyze
{
"filter": [
{
"type": "ngram",
"min_gram": 3,
"max_gram": 7
}
],
"text": "asiatuque"
}
[
"asi",
"asia",
"asiat",
"asiatu",
"asiatuq",
"sia",
"siat",
"siatu",
"siatuq",
"siatuqu",
"iat",
"iatu",
"iatuq",
"iatuqu",
"iatuque",
"atu",
"atuq",
"atuqu",
"atuque",
"tuq",
"tuqu",
"tuque",
"uqu",
"uque",
"que"
]
19

Création d’un analyseur custom pour utiliser le ngram filter
PUT /restaurant
{
"settings": {
"analysis": {
"filter": {"custom_ngram": {"type": "ngram", "min_gram": 3, "max_gram": 7}},
"analyzer": {"ngram_analyzer": {"tokenizer": "standard", "filter": ["asciifolding", "custom_ngram"]}}
}
},
"mappings": {
"restaurant": {
"properties": {
"title": {"type": "text", "analyzer": "ngram_analyzer"},
"description": {"type": "text", "analyzer": "ngram_analyzer"},
"adresse": {"type": "text", "analyzer": "ngram_analyzer"},
"type": {"type": "keyword"}
}
}
}
20

{
"query": {
"match": {
"description": "asiatuques"
}
}
}
{
"hits": {
"hits": [
{
"_score": 0.60128295,
"_source": {
"description": "Restaurant asiatique très copieux
pour un prix contenu",
"price": 14,
"type": "asiatique"
}
}, {
"_score": 0.46237043,
"_source": {
"title": 42,
"description": "Un restaurant gastronomique où
tout plat coûte 42 euros",
"price": 42,
"adresse": "10 rue de l'industrie, 31000
TOULOUSE",
21

Bruit induit par le ngram
{
"query": {
"match": {
"description": "gastronomique"
}
}
}
{
"hits": {
"hits": [
{
"_score": 0.6277555,
"_source": {
"title": 42,
"description": "Un restaurant gastronomique où tout plat
coûte 42 euros",
"price": 42,
}
},{
"_score": 0.56373334,
"_source": {
"description": "Restaurant asiatique très copieux pour un
prix contenu",
"price": 14,
"type": "asiatique"
}
},
22

Spécifier plusieurs analyseurs pour un champs
PUT /restaurant
{
"settings": {
"analysis": {
"filter": {"custom_ngram": {"type": "ngram", "min_gram": 3, "max_gram": 7}},
"analyzer": {"ngram_analyzer": {"tokenizer": "standard", "filter": ["asciifolding", "custom_ngram"]}
}
}
},
"mappings": {
"restaurant": {
"properties": {
"title": {"type": "text", "analyzer": "french"},
"description": {
"type": "text", "analyzer": "french",
"fields": {
"ngram": { "type": "text", "analyzer": "ngram_analyzer"}
},
23

Utilisation de plusieurs champs lors d’une recherche
{
"query": {
"multi_match": {
"query": "gastronomique",
"fields": [
"description^4",
"description.ngram"
]
}
}
}
{
"hits": {
"hits": [
{
"_score": 2.0649285,
"_source": {
"title": 42,
"description": "Un restaurant gastronomique où tout plat coûte 42 euros",
"price": 42,
}
},
{
"_score": 0 .56373334,
"_source": {
"description": "Restaurant asiatique très copieux pour un prix contenu",
"price": 14,
"type": "asiatique"
}
},
{
"_index": "restaurant",
24

Ignorer ou ne pas ignorer les stopwords tel est la question
POST :url/restaurant/restaurant/_bulk
{"index": {"_id": 1}}
{"title": 42, "description": "Un restaurant gastronomique donc cher ou tout plat coûte cher (42 euros)", "price":
42, "adresse": "10 rue de l'industrie, 31000 TOULOUSE", "type": "gastronomie"}
{"index": {"_id": 2}}
{"title": "Pizza de l'ormeau", "description": "Dans cette pizzeria on trouve des pizzas très bonnes et très
variés", "price": 10, "adresse": "1 place de l'ormeau, 31400 TOULOUSE", "type": "italien"}
{"index": {"_id": 3}}
{"title": "Chez l'oncle chan", "description": "Restaurant asiatique très copieux et pas cher", "price": 14,
"adresse": "13 route de labège, 31400 TOULOUSE", "type": "asiatique"}
25

Les stopwords ne sont pas
forcément vide de sens
{
"query": {
"match_phrase": {
"description": "pas cher"
}
}
}
{
"hits": {
"hits": [
{
"_source": {
"title": 42,
"description": "Un restaurant gastronomique donc
cher ou tout plat coûte cher (42 euros)",
"price": 42,
"adresse": "10 rue de l'industrie, 31000
TOULOUSE",
}
},{
"_source": {
"description": "Restaurant asiatique très copieux
et pas cher",
"price": 14,
"type": "asiatique"
}
}
26

Modification de l’analyser french
pour garder les stopwords
PUT /restaurant
{
"settings": {
"analysis": {
"filter": {
"french_elision": {
"type": "elision",
"articles_case": true,
"articles": [“l", "m", "t", "qu", "n", "s","j", "d", "c", "jusqu", "quoiqu", "lorsqu", "puisqu"]
},
"french_stemmer": {"type": "stemmer", "language": "light_french"}
},
"analyzer": {
"custom_french": {
"filter": [
"french_elision",
"lowercase",
"french_stemmer"
]
}
27

{
"query": {
"match_phrase": {
"description": "pas cher"
}
}
}
{
"hits": {
"hits": [
{
"_source": {
"description": "Restaurant
asiatique très copieux et pas cher",
"price": 14,
"adresse": "13 route de labège,
31400 TOULOUSE",
"type": "asiatique"
}
}
]
}
}
28

Rechercher avec les stopwords sans diminuer les
performances
{
"query": {
"match": {
"description": {
"query": "restaurant pas
cher",
"cutoff_frequency": 0.01
}
}
}
}
{
"query": {
"bool": {
"must": {
"bool": {
"should": [
{"term": {"description": "restaurant"}},
{"term": {"description": "cher"}}]
}
},
"should": [
{"match": {
"description": "pas"
}}
]
}
29

Personnaliser le “scoring”
{
"query": {
"function_score": {
"query": {
"match": {
"adresse": "toulouse"
}
},
"functions": [{
"filter": { "terms": { "type": ["asiatique", "italien"]}},
"weight": 2
}]
}
}
}
30

Personnaliser le “scoring”
{
"query": {
"function_score": {
"query": {
"match": {
"adresse": "toulouse"
}
},
"script_score": {
"script": {
"lang": "painless",
"inline": "_score * ( 1 + 10/doc['prix'].value)"
}
}
}
}
}
{
"hits": {
"hits": [
{
"_score": 0.53484553,
"_source": {
"title": "Pizza de l'ormeau",
"price": 10,
"adresse": "1 place de l'ormeau, 31400 TOULOUSE",
"type": "italien"
}
}, {
"_score": 0.26742277,
"_source": {
"title": 42,
"price": 42,
}
}, {
"_score": 0.26742277,
"_source": {
"price": 14,
"type": "asiatique"
}
}
]
}
}
31

Comment indexer les documents multilingues
Trois cas:
● Champs avec plusieurs langages (ex: {"message": "warning | attention | cuidado"})
○ Ngram
○ Analysé plusieurs fois le même champs avec un analyseur par langage
● Un champ par langue:
○ Facile car on peut spécifier un analyseur différent par langue
○ Attention de ne pas se retrouver avec un index parsemé
● Une version du document par langue (à favoriser)
○ Un index par document
○ Surtout ne pas utiliser des types pour chaque langue dans le même index (problème de statistique)
32

Gestion des synonymes
PUT /restaurant
{
"settings": {
"analysis": {
"filter": {
"french_elision": {
"type": "elision", "articles_case": true,
"articles": ["l", "m", "t", "qu", "n", "s", "j", "d", "c", "jusqu", "quoiqu", "lorsqu", "puisqu"]
},
"french_stemmer": {"type": "stemmer", "language": "light_french"},
"french_synonym": {"type": "synonym", "synonyms": ["sou marin => sandwitch", "formul, menu"]}
},
"analyzer": {
"french_with_synonym": {
"filter": ["french_elision", "lowercase", "french_stemmer", "french_synonym"]
}
}
}
},
"mappings": {
"restaurant": {
"properties": {
"description": { "type": "text", "analyzer": "french", "search_analyzer": "french_with_synonym"},
"adresse": {"type": "text", "analyzer": "french"},
"coord": {"type": "geo_point"},
33

Gestions des synonymes
{
"query": {
"match": {"description": "sous-marins"}
}
}
{
"hits": {
"hits": [
{
"_source": {
"title:": "Subway",
"description": "service très rapide,
rapport qualité/prix médiocre mais on peut choisir la
composition de son sandwitch",
"price": 8,
"adresse": "211 route de narbonne,
31520 RAMONVILLE",
"type": "fastfood",
"coord": "43.5577519,1.4625753"
}
}
]
}
}
34

Données géolocalisées
PUT /restaurant
{
"mappings": {
"restaurant": {
"properties": {
"description": {"type": "text", "analyzer": "french"
},
"adresse": {"type": "text","analyzer": "french"},
"coord": {"type": "geo_point"},
}
}
}
}
35

Données géolocalisées
POST restaurant/restaurant/_bulk
{"index": {"_id": 1}}
{"title": "bistronomique", "description": "Un restaurant bon mais un petit peu cher, les desserts sont excellents",
"price": 17, "adresse": "73 route de revel, 31400 TOULOUSE", "type": "français", "coord": "43.57417,1.4905748"}
{"index": {"_id": 2}}
{"title": "Pizza de l'ormeau", "description": "Dans cette pizzeria on trouve des pizzas très bonnes et très variés",
"price": 10, "adresse": "1 place de l'ormeau, 31400 TOULOUSE", "type": "italien", "coord": "43.579225,1.4835248"}
{"index": {"_id": 3}}
{"title": "Chez l'oncle chan", "description": "Restaurant asiatique très copieux pour un prix contenu", "price": 14,
"adresse": "18 rue des cosmonautetes, 31400 TOULOUSE", "type": "asiatique", "coord": "43.5612759,1.4936073"}
{"index": {"_id": 4}}
{"title:": "Un fastfood très connu", "description": "service très rapide, rapport qualité/prix médiocre", "price": 8,
"adresse": "210 route de narbonne, 31520 RAMONVILLE", "type": "fastfood", "coord": "43.5536343,1.476165"}
{"index": {"_id": 5}}
{"title:": "Subway", "description": "service très rapide, rapport qualité/prix médiocre mais on peut choisir la
composition de son sandwitch", "price": 8, "adresse": "211 route de narbonne, 31520 RAMONVILLE", "type": "fastfood",
"coord": "43.5577519,1.4625753"}
{"index": {"_id": 6}}
{"title:": "L'évidence", "description": "restaurant copieux et pas cher, cependant c'est pas bon", "price": 12,
"adresse": "38 route de revel, 31400 TOULOUSE", "type": "français", "coord": "43.5770109,1.4846573"} 36

Filtrage et trie sur données
géolocalisées
{
"query": {
"bool": {
"filter": [
{"term": {"type":"français"}},
{"geo_distance": {
"distance": "1km",
"coord": {"lat": 43.5739329, "lon": 1.4893669}
}}
]
}
},
"sort": [{
"geo_distance": {
"coord": {"lat": 43.5739329, "lon": 1.4893669},
"unit": "km"
}
}]
{
"hits": {
"hits": [
{
"_source": {
"title": "bistronomique",
"description": "Un restaurant bon mais un petit peu cher, les desserts sont
"price": 17,
"adresse": "73 route de revel, 31400 TOULOUSE",
"type": "français",
"coord": "43.57417,1.4905748"
},
"sort": [0.10081529266640063]
},{
"_source": {
"title:": "L'évidence",
"description": "restaurant copieux et pas cher, cependant c'est pas bon",
"price": 12,
"adresse": "38 route de revel, 31400 TOULOUSE",
"type": "français",
"coord": "43.5770109,1.4846573"
},
"sort": [0.510960087579506]
},{
"_source": {
"title:": "Chez Ingalls",
"description": "Contemporain et rustique, ce restaurant avec cheminée sert
savoyardes et des grillades",
37

Explication de la requête Bool
{
"query": {
"bool": {
"must": {"match": {"description": "sandwitch"}},
"should" : [
{"match": {"description": "bon"}},
{"match": {"description": "excellent"}}
],
"must_not": [
{"match_phrase": {
"description": "pas bon"
}}
],
"filter": [
{"range": {"price": {
"lte": "20"
}}}
]
}
} 38

Explication de la requête Bool
{
"query": {
"bool": {
"should" : [
{"match": {"description": "bon"}},
{"match": {"description": "excellent"}},
{"match": {"description": "service rapide"}}
],
"minimum_number_should_match": 2
}
}
}
39

Proposer une recherche avancé
à vos utilisateurs
{
"query": {
"simple_query_string": {
"fields": ["description", "title^2", "adresse", "type"],
"query": "-"pas bon" +(pizzi~2 OR sandwitch)"
}
}
}
{
"query": {
"bool": {
"must_not": {
"multi_match": {
"fields": [ "description", , "title^2", "adresse", "type"],
"type": "phrase",
"query": "pas bon"
}
},
"should": [
{"multi_match": {
"fields": [ "description", , "title^2", "adresse", "type"],
"fuziness": 2,
"max_expansions": 50,
"query": "pizzi"
}
},
{"multi_match": {
"fields": [ "description", , "title^2", "adresse",
"type"],
"query": "sandwitch"
} 40

Alias: comment se donner des marges de manoeuvre
PUT /restaurant_v1/
{
"mappings": {
"restaurant": {
"properties": {
"title": {"type": "text"},
"lat": {"type": "double"},
"lon": {"type": "double"}
}
}
}
}
POST /_aliases
{
"actions": [
{"add": {"index": "restaurant_v1", "alias": "restaurant_search"}},
{"add": {"index": "restaurant_v1", "alias": "restaurant_write"}}
]
}
41

Alias, Pipeline et reindexion
PUT /restaurant_v2
{
"mappings": {
"restaurant": {
"properties": {
"position": {"type": "geo_point"}
}
}
}
}
PUT /_ingest/pipeline/fixing_position
{
"description": "move lat lon into position parameter",
"processors": [
{"rename": {"field": "lat", "target_field": "position.lat"}},
{"rename": {"field": "lon", "target_field": "position.lon"}}
]
}
POST /_aliases
{
"actions": [
{"remove": {"index": "restaurant_v1", "alias":
"restaurant_search"}},
{"remove": {"index": "restaurant_v1", "alias":
"restaurant_write"}},
{"add": {"index": "restaurant_v2", "alias":
"restaurant_search"}},
{"add": {"index": "restaurant_v2", "alias": "restaurant_write"}}
]
}
POST /_reindex
{
"source": {"index": "restaurant_v1"},
"dest": {"index": "restaurant_v2", "pipeline": "fixing_position"}
}
42

Analyse des données des interventions des pompiers
de 2005 à 2014
PUT /pompier
{
"mappings": {
"intervention": {
"properties": {
"date": { "type": "date", "format": "yyyy-MM-dd HH:mm:ss"},
"type_incident": { "type": "keyword" },
"description_groupe": { "type": "keyword" },
"caserne": { "type": "integer"},
"ville": { "type": "keyword"},
"arrondissement": { "type": "keyword"},
"division": {"type": "integer"},
"position": {"type": "geo_point"},
"nombre_unites": {"type": "integer"}
}
}
}
}
43

Voir les différents incidents
GET /pompier/interventions/_search
{
"size": 0,
"aggs": {
"type_incident": {
"terms": {"field": "type_incident", "size": 100}
}
}
}
{
"aggregations": {
"type_incident": {
"buckets": [
{"key": "Premier répondant", "doc_count": 437891},
{"key": "Appel de Cie de détection", "doc_count": 76157},
{"key": "Alarme privé ou locale", "doc_count": 60879},
{"key": "Ac.véh./1R/s.v./ext/29B/D", "doc_count": 41734},
{"key": "10-22 sans feu", "doc_count": 29283},
{"key": "Acc. sans victime sfeu - ext.", "doc_count": 27663},
{"key": "Inondation", "doc_count": 26801},
{"key": "Problèmes électriques", "doc_count": 23495},
{"key": "Aliments surchauffés", "doc_count": 23428},
{"key": "Odeur suspecte - gaz", "doc_count": 21158},
{"key": "Déchets en feu", "doc_count": 18007},
{"key": "Ascenseur", "doc_count": 12703},
{"key": "Feu de champ *", "doc_count": 11518},
{"key": "Structure dangereuse", "doc_count": 9958},
{"key": "10-22 avec feu", "doc_count": 9876},
{"key": "Alarme vérification", "doc_count": 8328},
{"key": "Aide à un citoyen", "doc_count": 7722},
{"key": "Fuite ext.:hydrocar. liq. div.", "doc_count": 7351},
{"key": "Ac.véh./1R/s.v./V.R./29B/D", "doc_count": 6232},
{"key": "Feu de véhicule extérieur", "doc_count": 5943},
{"key": "Fausse alerte 10-19", "doc_count": 4680},
{"key": "Acc. sans victime sfeu - v.r", "doc_count": 3494},
{"key": "Assistance serv. muni.", "doc_count": 3431},
{"key": "Avertisseur de CO", "doc_count": 2542},
{"key": "Fuite gaz naturel 10-22", "doc_count": 1928},
{"key": "Matières dangereuses / 10-22", "doc_count": 1905},
{"key": "Feu de bâtiment", "doc_count": 1880},
{"key": "Senteur de feu à l'extérieur", "doc_count": 1566},
{"key": "Surchauffe - véhicule", "doc_count": 1499},
{"key": "Feu / Agravation possible", "doc_count": 1281},
{"key": "Fuite gaz naturel 10-09", "doc_count": 1257},
{"key": "Acc.véh/1rép/vict/ext 29D04", "doc_count": 1015},
{"key": "Acc. véh victime sfeu - (ext.)", "doc_count": 971},
44

Agrégations imbriquées
{
"size": 0,
"aggs": {
"ville": {
"terms": {"field": "ville"},
"aggs": {
"arrondissement": {
"terms": {"field": "arrondissement"}
}
}
}
}
}
{
"aggregations": {"ville": {"buckets": [
{
"key": "Montréal", "doc_count": 768955,
"arrondissement": {"buckets": [
{"key": "Ville-Marie", "doc_count": 83010},
{"key": "Mercier / Hochelaga-Maisonneuve", "doc_count": 67272},
{"key": "Côte-des-Neiges / Notre-Dame-de-Grâce", "doc_count": 65933},
{"key": "Villeray / St-Michel / Parc Extension", "doc_count": 60951},
{"key": "Rosemont / Petite-Patrie", "doc_count": 59213},
{"key": "Ahuntsic / Cartierville", "doc_count": 57721},
{"key": "Plateau Mont-Royal", "doc_count": 53344},
{"key": "Montréal-Nord", "doc_count": 40757},
{"key": "Sud-Ouest", "doc_count": 39936},
{"key": "Rivière-des-Prairies / Pointe-aux-Trembles", "doc_count": 38139}
]}
}, {
"key": "Dollard-des-Ormeaux", "doc_count": 17961,
{"key": "Indéterminé", "doc_count": 13452},
{"key": "Dollard-des-Ormeaux / Roxboro", "doc_count": 4477},
{"key": "Pierrefonds / Senneville", "doc_count": 10},
{"key": "Dorval / Ile Dorval", "doc_count": 8},
{"key": "Pointe-Claire", "doc_count": 8},
{"key": "Ile-Bizard / Ste-Geneviève / Ste-A-de-B", "doc_count": 6}
]}
}, {
"key": "Pointe-Claire", "doc_count": 17925,
{"key": "Indéterminé", "doc_count": 13126},
{"key": "Pointe-Claire", "doc_count": 4766},
{"key": "Dorval / Ile Dorval", "doc_count": 12},
{"key": "Dollard-des-Ormeaux / Roxboro", "doc_count": 7},
{"key": "Kirkland", "doc_count": 7},
{"key": "Beaconsfield / Baie d'Urfé", "doc_count": 5},
{"key": "Ile-Bizard / Ste-Geneviève / Ste-A-de-B", "doc_count": 1},
{"key": "St-Laurent", "doc_count": 1}
45

Calcul de moyenne et trie d'agrégation
{
"size": 0,
"aggs": {
"avg_nombre_unites_general": {
"avg": {"field": "nombre_unites"}
},
"type_incident": {
"terms": {
"field": "type_incident",
"size": 5,
"order" : {"avg_nombre_unites": "desc"}
},
"aggs": {
"avg_nombre_unites": {
"avg": {"field": "nombre_unites"}
}
}
}
}
{
"aggregations": {
"type_incident": {
"buckets": [
{
"key": "Feu / 5e Alerte", "doc_count": 162,
"avg_nombre_unites": {"value": 70.9074074074074}
}, {
}, {
"key": "Troisième alerte/autre que BAT", "doc_count": 1,
}, {
}, {
"key": "Deuxième alerte/autre que BAT", "doc_count": 8,
}
]
},
"avg_nombre_unites_general": {"value": 2.1374461758713728}
}
} 46

Percentile
{
"size": 0,
"aggs": {
"unites_percentile": {
"percentiles": {
"field": "nombre_unites",
"percents": [25, 50, 75, 100]
}
}
}
}
{
"aggregations": {
"unites_percentile": {
"values": {
"25.0": 1.0,
"50.0": 1.0,
"75.0": 3.0,
"100.0": 275.0
}
}
}
}
47

Histogram
{
"size": 0,
"query": {
"term": {"type_incident": "Inondation"}
},
"aggs": {
"unites_histogram": {
"histogram": {
"field": "nombre_unites",
"order": {"_key": "asc"},
"interval": 1
},
"aggs": {
"ville": {
"terms": {"field": "ville", "size": 1}
}
}
}
}
}
{
"aggregations": {
"unites_histogram": {
"buckets": [
{
"key": 1.0, "doc_count": 23507,
"ville": {"buckets": [{"key": "Montréal", "doc_count": 19417}]}
},{
"key": 2.0, "doc_count": 1550,
},{
"key": 3.0, "doc_count": 563,
},{
"key": 4.0, "doc_count": 449,
},{
"key": 5.0, "doc_count": 310,
},{
"key": 6.0, "doc_count": 215,
},{
"key": 7.0, "doc_count": 136,
},{
"key": 8.0, "doc_count": 35,
},{
"key": 9.0, "doc_count": 10,
},{
"key": 10.0, "doc_count": 11,
},{
"key": 11.0, "doc_count": 2,
48

“Significant term”
{
"size": 0,
"query": {
"term": {"type_incident": "Inondation"}
},
"aggs": {
"ville": {
"significant_terms": {"field": "ville", "size": 5, "percentage": {}}
}
}
}
{
"aggregations": {
"ville": {
"doc_count": 26801,
"buckets": [
{
"key": "Ile-Bizard",
"score": 0.10029498525073746,
"doc_count": 68, "bg_count": 678
},
{
"key": "Montréal-Nord",
"score": 0.0826544804291675,
},
{
"key": "Roxboro",
"score": 0.08181818181818182,
},
{
"key": "Côte St-Luc",
"score": 0.07654825526563974,
},
{
"key": "Saint-Laurent",
"score": 0.07317073170731707,
49

Agrégation et données géolocalisées
GET :url/pompier/interventions/_search
{
"size": 0,
"query": {
"regexp": {"type_incident": "Feu.*"}
},
"aggs": {
"distance_from_here": {
"geo_distance": {
"field": "position",
"unit": "km",
"origin": {
"lat": 45.495902,
"lon": -73.554263
},
"ranges": [
{ "to": 2},
{"from":2, "to": 4},
{"from":4, "to": 6},
{"from": 6, "to": 8},
{"from": 8}]
}
}
}
{
"aggregations": {
"distance_from_here": {
"buckets": [
{
"key": "*-2.0",
"from": 0.0,
"to": 2.0,
"doc_count": 80
},
{
"key": "2.0-4.0",
"from": 2.0,
"to": 4.0,
"doc_count": 266
},
{
"key": "4.0-6.0",
"from": 4.0,
"to": 6.0,
"doc_count": 320
},
{
"key": "6.0-8.0",
"from": 6.0,
"to": 8.0,
"doc_count": 326
},
{
"key": "8.0-*",
"from": 8.0,
"doc_count": 1720
}
]
}
}
}
50

Il y a t-il des questions ?
? 51

Proposer une recherche avancé
à vos utilisateurs
{
"query": {
"simple_query_string": {
"fields": ["description", "title^2", "adresse", "type"],
"query": ""service rapide"~2"
}
}
}
"hits": {
"hits": [
{
"_source": {
"title:": "Un fastfood très connu",
rapport qualité/prix médiocre",
"price": 8,
"adresse": "210 route de narbonne, 31520
RAMONVILLE",
"type": "fastfood",
"coord": "43.5536343,1.476165"
}
},{
"_source": {
"title:": "Subway",
rapport qualité/prix médiocre mais on peut choisir la
composition de son sandwitch",
"price": 8,
"adresse": "211 route de narbonne, 31520
{
"query": {
"match_phrase": {
"description": {
"slop": 2,
"query": "service rapide"
}
}
}
52

Comment faire ses mappings ElasticSearch aux petits oignons ? - LINAGORA

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