Stagging Remote Index Build v3

V3 version.

Stagging Remote Index Build

Contains changes from Jay and the update code for remote client

Remote index build POC version 7

1. Moved from singleton to per request object creation for s3 client.
2. Enable the code to pass the space type to the workers

Remote index build POC version 1

Remote index build POC version 1

merge-timx-fix-with-logs improved

merge-timx-fix-with-logs improved

Merge time fix with 2 IndexInput opened

Merge time fix with 2 IndexInput opened

merge-timx-fix-with-logs

Contains logs to know why merge time is high merge time

fix lucene IOContext

fix lucene IOContext to improve the merge time