Adds support for bootstrapping indexes post-launch.

Operators can now boostrap the searchable indexes post launch by
launching the IndexBootStrap immediate process.

Ex:

bin/pycc -D -x ion.processes.bootstrap.index_bootstrap.IndexBootStrap
op=clean_bootstrap -s luke
Merge pull request #522 from lukecampbell/es_any_launch

Adds support for bootstrapping indexes post-launch.