72 lines
2.2 KiB
Markdown
72 lines
2.2 KiB
Markdown
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---
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layout: default
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title: Split index
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parent: Index APIs
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grand_parent: REST API reference
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nav_order: 80
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---
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# Split index
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The split index API operation splits an existing read-only index into a new index, cutting each primary shard into some amount of primary shards in the new index.
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## Example
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```json
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PUT /sample-index1/_split/split-index1
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{
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"settings": {
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"index": {
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"number_of_shards": 4,
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"number_of_replicas": 2
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}
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},
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"aliases": {
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"sample-alias1": {}
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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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POST /<source-index>/_split/<target-index>
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PUT /<source-index>/_split/<target-index>
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```
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## Index naming restrictions
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OpenSearch indexes have the following naming restrictions:
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- All letters must be lowercase.
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- Index names can't begin with underscores (`_`) or hyphens (`-`).
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- Index names can't contain spaces, commas, or the following characters:
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`:`, `"`, `*`, `+`, `/`, `\`, `|`, `?`, `#`, `>`, or `<`
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## URL parameters
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Your request must include the source and target indexes. All split index parameters are optional.
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Parameter | Type | Description
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:--- | :--- | :---
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<source-index> | String | The source index to split.
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<target-index> | String | The index to create.
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wait_for_active_shards | String | The number of active shards that must be available before OpenSearch processes the request. Default is 1 (only the primary shard). Set to all or a positive integer. Values greater than 1 require replicas. For example, if you specify a value of 3, the index must have two replicas distributed across two additional nodes for the operation to succeed.
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master_timeout | Time | How long to wait for a connection to the master node. Default is `30s`.
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timeout | Time | How long to wait for the request to return. Default is `30s`.
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## Request body
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The split index API operation creates a new target index, so you can specify any [index settings]({{site.url}}{{site.baseurl}}/opensearch/rest-api/index-apis/create-index/#index-settings) and [aliases]({{site.url}}{{site.baseurl}}/opensearch/index-alias) to apply to the target index.
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## Response
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```json
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{
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"acknowledged": true,
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"shards_acknowledged": true,
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"index": "split-index1"
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}
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```
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