Add index commands and logging to the index process.
All the commands added are normally ran by the cron (group index), this just allows them to be ran on demmand.
This shouldn't be ran, whilst cron is running, as 2 process running the same thing may cause issues.

Commands

indexer:clean-changelogs - clear down change logs (runs after indexer:update-mview)
indexer:reindex-all-invalid - trigger a full reindex of all invalid indexes (only applicable when indexes are in 'realtime' mode)
indexer:update-mview - apply all change logs

Logging

By default this module will echo output when the indexers run. it will also log the info (level debug).