Searching for exact phrase with synonyms - php

Question

I am trying to build a query, where I am using exact phrase match and synonyms and I can't figure it out. Also, when using wildcard approach I don't know how to use fuzziness. Is it even possible with wildcards? It would be great to get same results for terms "call of duty", "cod" or "call of dutz".
I have created this index:
PUT exact_search
{
"settings": {
"index": {
"number_of_shards": "1",
"number_of_replicas": "0",
"analysis": {
"analyzer": {
"analyzer_exact": {
"type": "custom",
"tokenizer": "keyword",
"filter": [
"lowercase",
"icu_folding",
"synonyms"
]
}
},
"filter": {
"synonyms": {
"type": "synonym",
"synonyms_path": "synonyms.txt"
}
}
}
}
},
"mappings": {
"properties": {
"name": {
"type": "keyword",
"fields": {
"analyzer_exact": {
"type": "text",
"analyzer": "analyzer_exact"
}
}
}
}
}
}
And I fill it with these items:
POST exact_search/_doc/1
{
"name": "Hoodie Call of Duty"
}
POST exact_search/_doc/2
{
"name": "Call of Duty 2"
}
POST exact_search/_doc/3
{
"name": "Call of Duty: Modern Warfare 2"
}
POST exact_search/_doc/4
{
"name": "COD: Modern Warfare 2"
}
POST exact_search/_doc/5
{
"name": "Call of duty"
}
POST exact_search/_doc/6
{
"name": "Call of the sea"
}
POST exact_search/_doc/7
{
"name": "Heavy Duty"
}
synonyms.txt looks like this:
cod,call of duty
And what I am trying to achieve is, to get all the results (exept call of the sea and heavy duty) when I search "call of duty" or "cod".
So far, I constructed this query, but it does not work as expected when using "cod" search term (term "call of duty" works fine):
GET exact_search/_search
{
"explain": false,
"query":{
"bool":{
"must":[
{
"wildcard": {
"name.analyzer_exact": {
"value": "*cod*"
}
}
}
]
}
}
}
But the result is only two items:
{
"took" : 2,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 2,
"relation" : "eq"
},
"max_score" : 1.0,
"hits" : [
{
"_index" : "exact_search",
"_id" : "4",
"_score" : 1.0,
"_source" : {
"name" : "COD: Modern Warfare 2"
}
},
{
"_index" : "exact_search",
"_id" : "5",
"_score" : 1.0,
"_source" : {
"name" : "Call of duty"
}
}
]
}
}
It looks like that the synonyms are working, because it returns "call of duty" game, but it ignores the wildcards - it won't return Call of Duty 2 for example.
I need to look for the exact phrase match, because I dont't want to get results Heavy Duty or Call of the sea (when words "call" and "duty" match).
Thank you for pointing me in the right direction.

Answer 1

I have my doubts if the analyzer would generate the tokens synonymous with the analyzer_exact "tokenizer": "keyword".
I would change a few things to make it work.
keyword -> standard
"analyzer_exact": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"lowercase",
"synonyms"
]
}
I would use match phrase to eliminate names other than call of duty and cod.
{
"match_phrase": {
"name.analyzer_exact": "cod"
}
}
Response after changes
{
"hits": {
"hits": [
{
"_source": {
"name": "Call of duty"
}
},
{
"_source": {
"name": "COD: Modern Warfare 2"
}
},
{
"_source": {
"name": "Call of Duty 2"
}
},
{
"_source": {
"name": "hoddies Call of Duty"
}
},
{
"_source": {
"name": "Call of Duty: Modern Warfare 2"
}
}
]
}