[Doc] Add documentation for .replication-metadata-index for cross-cluster-replication. (#6082)

* [Doc] Add documentation for .replication-metadata-index for cross-cluster-replication.

Signed-off-by: Sanjay Kumar <sanjay.kumar_p@nokia.com>

* Update _tuning-your-cluster/replication-plugin/getting-started.md

Co-authored-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>
Signed-off-by: Sanjay Kumar <93825455+skumarp7@users.noreply.github.com>

* Update _tuning-your-cluster/replication-plugin/getting-started.md

Co-authored-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>
Signed-off-by: Sanjay Kumar <93825455+skumarp7@users.noreply.github.com>

* Update _tuning-your-cluster/replication-plugin/getting-started.md

Co-authored-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>
Signed-off-by: Sanjay Kumar <93825455+skumarp7@users.noreply.github.com>

* Update _tuning-your-cluster/replication-plugin/getting-started.md

Co-authored-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>
Signed-off-by: Sanjay Kumar <93825455+skumarp7@users.noreply.github.com>

* Update _tuning-your-cluster/replication-plugin/getting-started.md

Co-authored-by: Nathan Bower <nbower@amazon.com>
Signed-off-by: Sanjay Kumar <93825455+skumarp7@users.noreply.github.com>

* Update _tuning-your-cluster/replication-plugin/getting-started.md

Co-authored-by: Nathan Bower <nbower@amazon.com>
Signed-off-by: Sanjay Kumar <93825455+skumarp7@users.noreply.github.com>

---------

Signed-off-by: Sanjay Kumar <sanjay.kumar_p@nokia.com>
Signed-off-by: Sanjay Kumar <93825455+skumarp7@users.noreply.github.com>
Co-authored-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>
Co-authored-by: Nathan Bower <nbower@amazon.com>
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@ -237,6 +237,14 @@ curl -XGET -k -u 'admin:admin' 'https://localhost:9200/follower-01/_search?prett
}]
}
```
### `.replication-metadata-store` index
The `.replication-metadata-store` index is a persistent data store for replication-related metadata and auto-follow rules inside of a cluster. It stores the replication metadata of each index being replicated from the leader cluster to the follower cluster.
After the first replication API trigger, the `.replication-metadata-store` index is created inside the follower cluster. Any updates or additions to replication jobs or rules are also updated in the index. This enables the plugin to maintain a comprehensive record of replication status and rules across clusters.
`.replication-metdata-store` is a hidden index.
{: .note}
## Pause and resume replication