similarity - ElasticSearch Analyzer on text field -


here field on elasticsearch : 

"keywordname": {         "type": "text",         "analyzer": "custom_stop"       }

here analyzer :

"custom_stop": {       "type":      "custom",       "tokenizer": "standard",       "filter": [         "my_stop",         "my_snow",         "asciifolding"       ]     }

and here filters :

           "my_stop": {               "type":       "stop",               "stopwords":  "_french_"           },            "my_snow" : {                 "type" : "snowball",                 "language" : "french"             }

here documents index (in field : keywordname) :

"canne peche", "canne", "canne peche telescopique", "iphone 8", "iphone 8 case", "iphone 8 cover", "iphone 8 charger", "iphone 8 new"

when search "canne", gives me "canne" document, want :

get ads/_search {    "query": {     "match": {       "keywordname": {         "query": "canne",         "operator":  "and"       }     }   },   "size": 1 }

when search "canne à pêche", gives me "canne peche", ok, too. same "cannes à pêche" -> "canne peche" -> ok.

here tricky part : when search "iphone 8", gives me "iphone 8 cover" instead of "iphone 8". if change size, set 5 (as returns 5 results containing "iphone 8"). see "iphone 8" 4th result in term of score. first "iphone 8 cover" "iphone 8 case" "iphone 8 new" , "iphone 8" ...

here result of query :

{   "took": 5,   "timed_out": false,   "_shards": {     "total": 5,     "successful": 5,     "failed": 0   },   "hits": {     "total": 5,     "max_score": 1.4009607,     "hits": [       {         "_index": "ads",         "_type": "keyword",         "_id": "iphone 8 cover",         "_score": 1.4009607,         "_source": {           "keywordname": "iphone 8 cover"         }       },       {         "_index": "ads",         "_type": "keyword",         "_id": "iphone 8 case",         "_score": 1.4009607,         "_source": {           "keywordname": "iphone 8 case"         }       },       {         "_index": "ads",         "_type": "keyword",         "_id": "iphone 8 new",         "_score": 0.70293105,         "_source": {           "keywordname": "iphone 8 new"         }       },       {         "_index": "ads",         "_type": "keyword",         "_id": "iphone 8",         "_score": 0.5804671,         "_source": {           "keywordname": "iphone 8"         }       },       {         "_index": "ads",         "_type": "keyword",         "_id": "iphone 8 charge",         "_score": 0.46705723,         "_source": {           "keywordname": "iphone 8 charge"         }       }     ]   } }

how can keep flexibility concerning keyword "canne peche" (accents, capital letters, plural terms) tell him if there exact match ("iphone 8" = "iphone 8"), give me exact keywordname ?

i suggest this:

    "keywordname": {       "type": "text",       "analyzer": "custom_stop",       "fields": {         "raw": {           "type": "keyword"         }       }     }

and query:

{   "query": {     "bool": {       "should": [         {           "match": {             "keywordname": {               "query": "iphone 8",               "operator": "and"             }           }         },         {           "term": {             "keywordname.raw": {               "value": "iphone 8"             }           }         }       ]     }   },   "size": 10 }

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