Does Elasticsearch support nested or object fields in MultiMatch? - elasticsearch

Question

I have some object field named "FullTitleFts". It has field "text" inside. This query works fine (and returns some entries):
GET index/_search
{
"query": {
"bool": {
"must": [
{
"match": {
"fullTitleFts.text": "Ivan"
}
}
]
}
}
}
But this query returns nothing:
GET index/_search
{
"query": {
"bool": {
"should": [
{
"multi_match": {
"query": "Ivan",
"fields": [
"fullTitleFts.text"
]
}
}
]
}
}
}
Mapping of the field:
"fullTitleFts": {
"copy_to": [
"text"
],
"type": "keyword",
"fields": {
"text": {
"analyzer": "analyzer",
"term_vector": "with_positions_offsets_payloads",
"type": "text"
}
}
}
"analyzer": {
"filter": [
"lowercase",
"hypocorisms",
"protect_kw"
],
"char_filter": [
"replace_char_filter",
"e_char_filter"
],
"expand": "true",
"type": "custom",
"tokenizer": "standard"
}
e_char_filter is for replacing Cyrillic char "ё" to "е", replace_char_filter is for removing "�" from text. protect_kw is keyword_marker for some Russian unions. hypocorisms is synonym_graph for making another forms of names.
Example of analyzer output:
GET index/_analyze
{
"analyzer": "analyzer",
"text": "Алёна�"
}
{
"tokens" : [
{
"token" : "аленка",
"start_offset" : 0,
"end_offset" : 5,
"type" : "SYNONYM",
"position" : 0
},
{
"token" : "аленушка",
"start_offset" : 0,
"end_offset" : 5,
"type" : "SYNONYM",
"position" : 0
},
{
"token" : "алена",
"start_offset" : 0,
"end_offset" : 5,
"type" : "<ALPHANUM>",
"position" : 0
}
]
}
I've also found this question. And it seems that the answer didn't really work - author had to add "include_in_root" option in mapping. So i wondering if multi match supports nested or object fields at all. I am also can't find anything about it in docs.

Answer 1

As you have provided index mapping, your field is defined as multi-field and not as nested or object field. So both match and multi_match should work without providing path. you can just use field name as fullTitleFts.text when need to search on text type and fullTitleFts when need to search on keyword type.