[RW Separation] `_cat/indices` does not include search replica information in the response

[vinaykpud]

Describe the bug

When querying _cat/indices, the response does not include information about search replicas, even if they exist in the cluster.

Related component

Search:Performance

To Reproduce

1. Create a cluster with 3 nodes.
2. Designate one of the nodes as a Search node.
3. Create an index with the following configuration:
   • 1 Primary shard (1P)
   • 1 Replica shard (1R)
   • 1 Search replica (1SR)
4. Query _cat/indices using the following command:

   curl -X GET "http://localhost:9200/_cat/indices?v"

health status index    uuid                   pri rep docs.count docs.deleted store.size pri.store.size
green  open   products Tc3DyEg9QJaGykLxY_9dMw   1   1          2            0     25.2kb          8.3kb

The response does not include a column for search replicas.

Expected behavior

The response should include a column for search replicas.

Additional Details