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Split index
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.
Example
PUT /sample-index1/_split/split-index1
{
"settings": {
"index": {
"number_of_shards": 4,
"number_of_replicas": 2
}
},
"aliases": {
"sample-alias1": {}
}
}
Path and HTTP methods
POST /<source-index>/_split/<target-index>
PUT /<source-index>/_split/<target-index>
Index naming restrictions
OpenSearch indexes have the following naming restrictions:
- All letters must be lowercase.
- Index names can’t begin with underscores (
_) or hyphens (-). -
Index names can’t contain spaces, commas, or the following characters:
:,",*,+,/,\,|,?,#,>, or<
URL parameters
Your request must include the source and target indexes. All split index parameters are optional.
| Parameter | Type | Description |
|---|---|---|
| <source-index> | String | The source index to split. |
| <target-index> | String | The index to create. |
| 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. |
| master_timeout | Time | How long to wait for a connection to the master node. Default is 30s. |
| timeout | Time | How long to wait for the request to return. Default is 30s. |
Request body
The split index API operation creates a new target index, so you can specify any index settings and aliases to apply to the target index.
Response
{
"acknowledged": true,
"shards_acknowledged": true,
"index": "split-index1"
}