How to use Get Index API for version 6.3(current release)

Hi, I am currently using Java High Level REST Client for connection and it seems like for version 6.3 there is no Get Index API (which is enabled in later version but not released yet).
So is there any other way to use java high level rest client to extract all information under a given index?

You can get the LowLevelClient from the HLClient and then just use the GET API to implement missing pieces.

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