Elastic Search Closest match with space in fields - elasticsearch

Question

I have data in elasticsearch fields which contains "face mask", I am able to fetch this data with the following query with search_term set to "face", "face mask", "mask" and "face masks".
{
"query": {
"bool": {
"must": [{
"multi_match": {
"query": ${search_term},
"fields": [
"title^4",
"titleNgram^3",
],
"fuzziness": "auto"
}
}]
}
}
}
What I am not able to achieve is when I query for "facemask" (no spaces in search_term) it does not return any document containing "face" or "mask", but, it returns documents with fields containing "facewash". Is there a way to achieve it?
Mapping is shared below
{
"mappings": {
"_doc": {
"properties": {
"title": {
"type": "text"
},
"titleNgram": {
"search_analyzer": "whitespace_analyzer",
"analyzer": "nGram_analyzer",
"type": "text"
},
"id": {
"index": false,
"type": "text"
}
}
}
}
}

Answer 1

You can try removing the "search_analyzer": "whitespace_analyzer", and reindex the data and use the same query and it should return you the expected results.
{
"mappings": {
"_doc": {
"properties": {
"title": {
"type": "text"
},
"titleNgram": {
"search_analyzer": "whitespace_analyzer", --> remove this line.
"analyzer": "nGram_analyzer",
"type": "text"
},
"id": {
"index": false,
"type": "text"
}
}
}
}
}
Edit: I tested it locally and it worked for me, below is the sample I used
Search query
{
"query": {
"multi_match": {
"query": "face mask",
"fields": [
"titlengram",
"title"
]
}
}
}
And it gives your expected doc
"hits": [
{
"_index": "ngram",
"_type": "_doc",
"_id": "1",
"_score": 2.3014567,
"_source": {
"title": "face mask",
"titlengram": "face mask"
}
}