phase_took documentation (opensearch-project#5154)

* phase_took documentation

Signed-off-by: David Zane <davizane@amazon.com>

* Update _api-reference/cluster-api/cluster-settings.md

Co-authored-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>
Signed-off-by: David Z <38449481+dzane17@users.noreply.github.com>

* Update _api-reference/search.md

Co-authored-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>
Signed-off-by: David Z <38449481+dzane17@users.noreply.github.com>

---------

Signed-off-by: David Zane <davizane@amazon.com>
Signed-off-by: David Z <38449481+dzane17@users.noreply.github.com>
Co-authored-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>

_api-reference/cluster-api/cluster-settings.md

@@ -74,6 +74,7 @@ The following request field parameters are compatible with the cluster API.
 | breaker.model_inference.limit | String | The limit for the trained model circuit breaker. Default is `50%` of the JVM heap. |
 | breaker.model_inference.overhead | Integer | The constant that all trained model estimations are multiplied by to determine a final estimation. Default is `1`. |
 | search.max_buckets | Integer | The maximum number of aggregation buckets allowed in a single response. Default is `65536`. |
+| search.phase_took_enabled | Boolean | Enables returning phase-level `took` time values in search responses. Default is `false`. |
 | snapshot.max_concurrent_operations | Integer | The maximum number of concurrent snapshot operations. Default is `1000`. |
 | slm.health.failed_snapshot_warn_threshold | String | The number of failed invocations since the last successful snapshot that will indicate a problem as per the health API profile. Default is five repeated failures: `5L`. |
 | indices.breaker.total.limit | String | The starting limit for the overall parent breaker. Default is `70%` of the JVM heap if `indices.breaker.total.use_real_memory` is set to `false`. Default is `95%` of the JVM heap if `indices.breaker.total.use_real_memory` is set to `true`. |

_api-reference/search.md

@@ -59,6 +59,7 @@ ignore_throttled | Boolean | Whether to ignore concrete, expanded, or indexes wi
 ignore_unavailable | Boolean | Specifies whether to include missing or closed indexes in the response. Default is false.
 lenient | Boolean | Specifies whether OpenSearch should accept requests if queries have format errors (for example, querying a text field for an integer). Default is false.
 max_concurrent_shard_requests | Integer | How many concurrent shard requests this request should execute on each node. Default is 5.
+phase_took | Boolean | Whether to return phase-level `took` time values in the response. Default is false.
 pre_filter_shard_size | Integer | A prefilter size threshold that triggers a prefilter operation if the request exceeds the threshold. Default is 128 shards.
 preference | String | Specifies the shards or nodes on which OpenSearch should perform the search. For valid values, see [The `preference` query parameter](#the-preference-query-parameter). 
 q | String | Lucene query string’s query.