Return only exact matches (substrings) in full text search (elasticsearch) - elasticsearch

Question

I have an index in elasticsearch with a 'title' field (analyzed string field). If I have the following documents indexed:
{title: "Joe Dirt"}
{title: "Meet Joe Black"}
{title: "Tomorrow Never Dies"}
and the search query is "I want to watch the movie Joe Dirt tomorrow"
I want to find results where the full title matches as a substring of the search query. If I use a straight match query, all of these documents will be returned because they all match one of the words. I really just want to return "Joe Dirt" because the title is an exact match substring of the search query.
Is that possible in elasticsearch?
Thanks!

Answer 1

One way to achieve this is as follows :
1) while indexing index title using keyword tokenizer
2) While searching use shingle token-filter to extract substring from the query string and match against the title
Example:
Index Settings
put test
{
"settings": {
"analysis": {
"analyzer": {
"substring": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"lowercase",
"substring"
]
},
"exact": {
"type": "custom",
"tokenizer": "keyword",
"filter": [
"lowercase"
]
}
},
"filter": {
"substring": {
"type":"shingle",
"output_unigrams" : true
}
}
}
},
"mappings": {
"movie": {
"properties": {
"title": {
"type": "string",
"fields": {
"raw": {
"type": "string",
"analyzer": "exact"
}
}
}
}
}
}
}
Index Documents
put test/movie/1
{"title": "Joe Dirt"}
put test/movie/2
{"title": "Meet Joe Black"}
put test/movie/3
{"title": "Tomorrow Never Dies"}
Query
post test/_search
{
"query": {
"match": {
"title.raw" : {
"analyzer": "substring",
"query": "Joe Dirt tomorrow"
}
}
}
}
Result :
"hits": {
"total": 1,
"max_score": 0.015511602,
"hits": [
{
"_index": "test",
"_type": "movie",
"_id": "1",
"_score": 0.015511602,
"_source": {
"title": "Joe Dirt"
}
}
]
}