OpenSearch/docs/reference/docs/multi-termvectors.asciidoc

[[docs-multi-termvectors]]
== Multi termvectors API

Multi termvectors API allows to get multiple termvectors at once. The
documents from which to retrieve the term vectors are specified by an index,
type and id. But the documents could also be artificially provided
The response includes a `docs`
array with all the fetched termvectors, each element having the structure
provided by the <<docs-termvectors,termvectors>>
API. Here is an example:

[source,js]
--------------------------------------------------
curl 'localhost:9200/_mtermvectors' -d '{
   "docs": [
      {
         "_index": "testidx",
         "_type": "test",
         "_id": "2",
         "term_statistics": true
      },
      {
         "_index": "testidx",
         "_type": "test",
         "_id": "1",
         "fields": [
            "text"
         ]
      }
   ]
}'
--------------------------------------------------

See the <<docs-termvectors,termvectors>> API for a description of possible parameters.

The `_mtermvectors` endpoint can also be used against an index (in which case it
is not required in the body):

[source,js]
--------------------------------------------------
curl 'localhost:9200/testidx/_mtermvectors' -d '{
   "docs": [
      {
         "_type": "test",
         "_id": "2",
         "fields": [
            "text"
         ],
         "term_statistics": true
      },
      {
         "_type": "test",
         "_id": "1"
      }
   ]
}'
--------------------------------------------------

And type:

[source,js]
--------------------------------------------------
curl 'localhost:9200/testidx/test/_mtermvectors' -d '{
   "docs": [
      {
         "_id": "2",
         "fields": [
            "text"
         ],
         "term_statistics": true
      },
      {
         "_id": "1"
      }
   ]
}'
--------------------------------------------------

If all requested documents are on same index and have same type and also the parameters are the same, the request can be simplified:

[source,js]
--------------------------------------------------
curl 'localhost:9200/testidx/test/_mtermvectors' -d '{
    "ids" : ["1", "2"],
    "parameters": {
    	"fields": [
         	"text"
      	],
      	"term_statistics": true,
      	…
    }
}'
--------------------------------------------------

Additionally, just like for the <<docs-termvectors,termvectors>>
API, term vectors could be generated for user provided documents. The syntax
is similar to the <<search-percolate,percolator>> API. The mapping used is
determined by `_index` and `_type`.

[source,js]
--------------------------------------------------
curl 'localhost:9200/_mtermvectors' -d '{
   "docs": [
      {
         "_index": "testidx",
         "_type": "test",
         "doc" : {
            "fullname" : "John Doe",
            "text" : "twitter test test test"
         }
      },
      {
         "_index": "testidx",
         "_type": "test",
         "doc" : {
           "fullname" : "Jane Doe",
           "text" : "Another twitter test ..."
         }
      }
   ]
}'
--------------------------------------------------