Add ES fixup tool to fix wrong timestamps and add missing "_id" attribute.

Related to #728 and #737.

(cherry picked from commits b473e09 303bf42 7c05e61 6b3ba74 fc7f5b4 dd0a288)
Add shell wrapper script to start the ES timestamp fixup.

Fixes #737.

(cherry picked from commit ab1ba1bfb0a7d9b07be6e572544f7831dceb3c73)
Remove obsolete plugin subdirs from the tarballs.

(cherry picked from commit a5ad82618184a5ed6298d75fc015b514542a87a3)
Merge branch '0.90' into 0.91