How to do _cat/indices/<index_name_with_reg_ex> in JAVA

Elastic Stack Elasticsearch
1

I have some indexes with name test-1-in, test-2-in, test-3-in. I want to do _cat/indices/test-*-in from JAVA API. How to do this?

2

You can't call cat API from transport client. It's a REST API only.

But you can look at the source code to see how it's implemented behind the scene and do the same thing from the transport client.

3

Thanks @dadoonet. I dug into _cat implementation and found out what they are doing. Here it is:

final ClusterStateRequest clusterStateRequest = new ClusterStateRequest();
clusterStateRequest.clear().metaData(true);
final IndicesOptions strictExpandIndicesOptions = IndicesOptions.strictExpand();
clusterStateRequest.indicesOptions(strictExpandIndicesOptions);
ClusterStateResponse clusterStateResponse = client.admin().cluster().state(clusterStateRequest).get(); 
clusterStateResponse.getState().getMetadata().getIndices()

This will give all indexes. After that the reg ex matching has to be done manually.