Find concatenate words in Elasticsearch -

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say have indexed data

song:{   title:"laser game" }

but user searching 

lasergame

how go mapping/indexing/querying this?

this kind of tricky problem.

1) guess effective way might use compound token filter, word list made of words think user might concatenate. 

"settings": {     "analysis": {       "analyzer": {         "concatenate_split": {           "type": "custom",           "tokenizer": "standard",           "filter": [             "lowercase",             "myfilter"           ]         }       },       "filter": {         "myfilter": {           "type": "dictionary_decompounder",           "word_list": [             "laser",             "game",             "lean",             "on",             "die",             "hard"           ]         }       }     }   }

after applying analyzer, lasergame split laser , game along lasergame, give results has any of words.

2) approach concatenating whole title pattern replace char filter replacing spaces.

{     "index" : {         "analysis" : {             "char_filter" : {                 "my_pattern":{                     "type":"pattern_replace",                     "pattern":"\\s+",                     "replacement":""                 }             },             "analyzer" : {                 "custom_with_char_filter" : {                     "tokenizer" : "standard",                     "char_filter" : ["my_pattern"]                 }             }         }     } }

you need use multi fields approach, pattern, laser game indexed lasergame , query work. here problem laser game play indexed lasegameplay , search lasergame wont return might want consider using prefix query or wildcard query this.

3) might not make sense use synonym filter, if think users concatenating words.

hope helps!


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