137 lines
4.9 KiB
Markdown
137 lines
4.9 KiB
Markdown
---
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layout: default
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title: Multi-get document
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parent: Document APIs
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nav_order: 30
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---
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# Multi-get documents
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Introduced 1.0
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{: .label .label-purple }
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The multi-get operation allows you to execute multiple GET operations in one request, so you can get back all documents that match your criteria.
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## Example without specifying index in URL
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```json
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GET _mget
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{
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"docs": [
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{
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"_index": "sample-index1",
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"_id": "1"
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},
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{
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"_index": "sample-index2",
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"_id": "1",
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"_source": {
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"include": ["Length"]
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}
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}
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]
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}
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```
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## Example of specifying index in URL
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```json
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GET sample-index1/_mget
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{
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"docs": [
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{
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"_id": "1",
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"_source": false
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},
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{
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"_id": "2",
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"_source": [ "Director", "Title" ]
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}
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]
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}
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```
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## Path and HTTP methods
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```
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GET _mget
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GET <index>/_mget
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```
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## URL parameters
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All multi-get URL parameters are optional.
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Parameter | Type | Description
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:--- | :--- | :--- | :---
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<index> | String | Name of the index to retrieve documents from.
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preference | String | Specifies the nodes or shards OpenSearch should execute the multi-get operation on. Default is random.
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realtime | Boolean | Specifies whether the operation should run in realtime. If false, the operation waits for the index to refresh to analyze the source to retrieve data, which makes the operation near-realtime. Default is `true`.
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refresh | Boolean | If true, OpenSearch refreshes shards to make the multi-get operation available to search results. Valid options are `true`, `false`, and `wait_for`, which tells OpenSearch to wait for a refresh before executing the operation. Default is `false`.
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routing | String | Value used to route the multi-get operation to a specific shard.
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stored_fields | Boolean | Specifies whether OpenSearch should retrieve documents fields from the index instead of the document's `_source`. Default is `false`.
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_source | String | Whether to include the `_source` field in the query response. Default is `true`.
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_source_excludes | String | A comma-separated list of source fields to exclude in the query response.
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_source_includes | String | A comma-separated list of source fields to include in the query response.
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## Request body
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If you don't specify an index in your request's URL, you must specify your target indices and the relevant document IDs in the request body. Other fields are optional.
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Field | Type | Description | Required
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:--- | :--- | :--- | :---
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docs | Array | The documents you want to retrieve data from. Can contain the attributes: `_id`, `_index`, `_routing`, `_source`, and `_stored_fields`. If you specify an index in the URL, you can omit this field and add IDs of the documents to retrieve. | Yes if an index is not specified in the URL
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_id | String | The ID of the document. | Yes if `docs` is specified in the request body
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_index | String | Name of the index. | Yes if an index is not specified in the URL
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_routing | String | The value of the shard that has the document. | Yes if a routing value was used when indexing the document
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_source | Object | Specifies whether to return the `_source` field from an index (boolean), whether to return specific fields (array), or whether to include or exclude certain fields. | No
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_source.includes | Array | Specifies which fields to include in the query response. For example, `"_source": { "include": ["Title"] }` retrieves `Title` from the index. | No
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_source.excludes | Array | Specifies which fields to exclude in the query response. For example, `"_source": { "exclude": ["Director"] }` excludes `Director` from the query response. | No
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ids | Array | IDs of the documents to retrieve. Only allowed when an index is specified in the URL. | No
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## Response
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```json
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{
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"docs": [
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{
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"_index": "sample-index1",
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"_id": "1",
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"_version": 4,
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"_seq_no": 5,
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"_primary_term": 19,
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"found": true,
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"_source": {
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"Title": "Batman Begins",
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"Director": "Christopher Nolan"
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}
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},
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{
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"_index": "sample-index2",
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"_id": "1",
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"_version": 1,
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"_seq_no": 6,
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"_primary_term": 19,
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"found": true,
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"_source": {
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"Title": "The Dark Knight",
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"Director": "Christopher Nolan"
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}
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}
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]
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}
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```
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## Response body fields
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Field | Description
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:--- | :---
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_index | The name of the index.
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_id | The document's ID.
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_version | The document's version number. Updated whenever the document changes.
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_seq_no | The sequnce number assigned when the document is indexed.
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primary_term | The primary term assigned when the document is indexed.
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found | Whether the document exists.
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_routing | The shard that the document is routed to. If the document is not routed to a particular shard, this field is omitted.
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_source | Contains the document's data if `found` is true. If `_source` is set to false or `stored_fields` is set to true in the URL parameters, this field is omitted.
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_fields | Contains the document's data that's stored in the index. Only returned if both `stored_fields` and `found` are true.
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