Add reindexing command line with rate and time estimate

[liamwhite]

No imports, no aliases. Just easy and fast reindexing with automatic progress reports for production maintenance.

iex(1)> Philomena.SearchIndexer.recreate_reindex_schema_destructive!(Philomena.Tags.Tag)
Philomena.Tags.Tag: 433106/753474 [150034/sec], ETA: about 3 second(s)
Philomena.Tags.Tag: 753474/753474 [141754/sec], done.
:ok

These will attempt to completely max out the machine to do indexing during a downtime. If this is not desired (e.g., a live reindex), then the following can be used instead to explicitly control the level of concurrency used by the task:

Philomena.SearchIndexer.reindex_schema(Philomena.Images.Image, max_concurrency: 2)

Functions from the SearchIndexer module:

• Philomena.SearchIndexer.recreate_reindex_all_destructive!(): delete, recreate and reindex all search indices
• Philomena.SearchIndexer.recreate_reindex_schema_destructive!(Philomena.Tags.Tag): delete, recreate and reindex specific search index
• Philomena.SearchIndexer.reindex_schema!(Philomena.Images.Image): reindex specific search index, without recreating it

[Meow]

Add an option to throttle them for live reindexes.