Elasticsearch: Shingles not working with odd no. of search words - elasticsearch

Question

When trying to search with odd no. of words with my shingle analyzer no result shows up.
'new delhi abcd' does not return any results but 'new delhi abcd xyz' returns
My analyzers look like below
{
"search": {
"settings": {
"index": {
"analysis": {
"filter": {
"my_shingle_filter": {
"max_shingle_size": "2",
"min_shingle_size": "2",
"output_unigrams": "false",
"type": "shingle"
},
"autocomplete_filter": {
"type": "edge_ngram",
"min_gram": "1",
"max_gram": "40"
}
},
"analyzer": {
"my_shingle_analyzer": {
"filter": [
"lowercase",
"my_shingle_filter"
],
"type": "custom",
"tokenizer": "whitespace"
},
"shingle_with_autocomplete": {
"filter": [
"lowercase",
"my_shingle_filter",
"autocomplete_filter"
],
"type": "custom",
"tokenizer": "whitespace"
}
}
}
}
}
}
}
The mapping for the type is shared below
{
"search": {
"mappings": {
"address": {
"properties": {
"full_address": {
"type": "text",
"norms": false,
"fields": {
"edge_n_grams": {
"type": "text",
"norms": false,
"analyzer": "autocomplete"
},
"shingles": {
"type": "text",
"norms": false,
"analyzer": "shingle_with_autocomplete"
},
"synonym": {
"type": "text",
"norms": false,
"analyzer": "synonym_autocomplete"
}
},
"analyzer": "whitespace"
}
}
}
}
}
}
Query 1
GET search/address/_search?_source=full_address
{
"query": {
"match": {
"full_address.shingles": {
"query": "new delhi",
"analyzer": "my_shingle_analyzer"
}
}
}
}
Results
{
...
"hits": {
"total": 21801,
"max_score": 8.015874,
"hits": [{
"_index": "search",
"_type": "address",
"_id": "581c50297fd84ecc35420570",
"_score": 8.015874,
"_source": {
"full_address": "new delhi nagar palika adarsh vidyalay new delhi nagar palika adarsh vidyalay tilak lane tilak marg area new delhi delhi 110001"
}
}, {
"_index": "search",
"_type": "address",
"_id": "581c502a7fd84ecc35422010",
"_score": 7.013889,
"_source": {
"full_address": "kingdom hall of jehovant witness gyan bharti public school saket new delhi new delhi delhi 110017"
}
},
...
]
}
}
Query 2
GET search/address/_search?_source=full_address
{
"query": {
"match": {
"full_address.shingles": {
"query": "new delhi nag",
"analyzer": "my_shingle_analyzer"
}
}
}
}
Results
{
...,
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
'new delhi nagar pal' returns proper results.
Any help/insights would be appreciated

Answer 1

This is a bug in ES 5.2.x. Issue is with the single filter in new version