CatIndices not supported with IElasticClient

[satishmallik]

I need to use CatIndices for my requirement. But I need to use ElasticClient for the same instead of IElasticClient.

Could you please add CatIndices in IElasticClient interface?

[Mpdreamz]

Thank you for reporting this @satishmallik I send a PR to fix this and it should make it into the next release.