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_index field
edit_index field
editWhen performing queries across multiple indexes, it is sometimes desirable to
add query clauses that are associated with documents of only certain indexes.
The _index field allows matching on the index a document was indexed into.
Its value is accessible in term, or terms queries, aggregations,
scripts, and when sorting:
The _index is exposed as a virtual field — it is not added to the
Lucene index as a real field. This means that you can use the _index field
in a term or terms query (or any query that is rewritten to a term
query, such as the match, query_string or simple_query_string query),
but it does not support prefix, wildcard, regexp, or fuzzy queries.
# Example documents
PUT index_1/_doc/1
{
"text": "Document in index 1"
}
PUT index_2/_doc/2?refresh=true
{
"text": "Document in index 2"
}
GET index_1,index_2/_search
{
"query": {
"terms": {
"_index": ["index_1", "index_2"]
}
},
"aggs": {
"indices": {
"terms": {
"field": "_index",
"size": 10
}
}
},
"sort": [
{
"_index": {
"order": "asc"
}
}
],
"script_fields": {
"index_name": {
"script": {
"lang": "painless",
"source": "doc['_index']"
}
}
}
}