Somewhere in this section we must cover `IndexContributors`.
We should detail that IndexContributors require a full reindex to add their contributions to the index. We cannot guarantee that a contributor will be run when the index is first created (OSGi dynamism).
See internal Search Team Touch Base doc, Engineering section, from July 20, 2018, for additional details.
Note: We have commented out links to this (not yet written) documentation in the deployment guide. As part of this ticket, revive those links.