[BUILD] Randomize JVM heapsize between 512 and 1024m
Dependencies: Upgrade to Apache HttpComponents client 4.3.5

Closes #7342
[TEST] Muted tests
[TEST] copied delete bw comp tests to usual intergration tests

 Added AwaitsFix to testDeletebyQuery and testDeleteRoutingRequired while checking if they fail as usual integration tests.
Internal: move index templates api back to indices category and make put template and create index implement IndicesRequest

Closes #7378