Adds tombstones to cluster state for index deletions#17265

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abeyad wants to merge 7 commits intoelastic:masterfrom abeyad:feature/tombstone-deleted-indices

+1,263-172

Commits on Apr 14, 2016

Adds tombstones to cluster state for index deletions
Ali Beyad
committed

Commits on Apr 15, 2016

Code review comment fixes
Ali Beyad
committed

Commits on Apr 21, 2016

Address code review comments
Ali Beyad
committed
Changed purge - called within the tombstone builder's build() method now
Ali Beyad
committed
Addressed more suggestions
Ali Beyad
committed

Commits on Apr 25, 2016

Addresses code review comments
Ali Beyad
committed
Made a variable final
Ali Beyad
committed