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The `wait_for_metadata_version` parameter will instruct the cluster state api to only return a cluster state until the metadata's version is equal or greater than the version specified in `wait_for_metadata_version`. If the specified `wait_for_timeout` has expired then a timed out response is returned. (a response with no cluster state and wait for timed out flag set to true) In the case metadata's version is equal or higher than `wait_for_metadata_version` then the api will immediately return. This feature is useful to avoid external components from constantly polling the cluster state to whether somethings have changed in the cluster state's metadata. |
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