Search all unique terms from a given query in elastic search - elasticsearch

Question

I am trying to search for all the unique names in the index test_nested.
GET test_nested/_mappings
{
"test_nested": {
"mappings": {
"my_type": {
"properties": {
"group": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"user": {
"type": "nested",
"properties": {
"name": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
}
}
}
}
}
}
GET test_nested/_search
{
"took": 2,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 4,
"max_score": 1,
"hits": [
{
"_index": "test_nested",
"_type": "my_type",
"_id": "AWG5iVBz4bQsVnslc9gL",
"_score": 1,
"_source": {
"group": "fans",
"user": [
{
"name": "Linux"
},
{
"name": "Android (operating system)"
},
{
"name": "Widows 10"
}
]
}
},
{
"_index": "test_nested",
"_type": "my_type",
"_id": "AWG5ieKW4bQsVnslc9gM",
"_score": 1,
"_source": {
"group": "fans",
"user": [
{
"name": "Bitcoin"
},
{
"name": "PHP"
},
{
"name": "Microsoft Windows"
}
]
}
},
{
"_index": "test_nested",
"_type": "my_type",
"_id": "AWG5irrV4bQsVnslc9gN",
"_score": 1,
"_source": {
"group": "fans",
"user": [
{
"name": "Windows XP"
}
]
}
},
{
"_index": "test_nested",
"_type": "my_type",
"_id": "1",
"_score": 1,
"_source": {
"group": "fans",
"user": [
{
"name": "iOS"
},
{
"name": "Android (operating system)"
},
{
"name": "Widows 10"
},
{
"name": "Widows XP"
}
]
}
}
]
}
}
I want all the unique names for a term. i.e. if I search for "wi"* then I should get [Microsoft Windows, Widows 10, Windows XP]

Answer 1

I don't know exactly what you mean but I use that query to list all statuses:
GET order/default/_search
{
"size": 0,
"aggs": {
"status_terms": {
"terms": {
"field": "status.keyword",
"missing": "N/A",
"min_doc_count": 0,
"order": {
"_key": "asc"
}
}
}
}
}
My model has status field and that query lists all statuses.
This is bucket aggregations
One of fields in result is:
sum_other_doc_count - Elastic returns the top unique terms. So if you have many different terms then some of them will not appear in the results. This field is a sum of documents which will not be a part of the response.
For nested objects try to read and use Nested Query docs

Answer 2

I found the solution. Hope it helps someone.
GET record_new/_search
{
"size": 0,
"query": {
"term": {
"software_tags": {
"value": "windows"
}
}
},
"aggs": {
"software_tags": {
"terms": {
"field": "software_tags.keyword",
"include" : ".*Windows.*",
"size": 10000,
"order": {
"_count": "desc"
}
}
}
}
}