Pass any errors through to es-* events
Pass any errors through to es-* events

If there is an error indexing or removing a document then we want to be
able to access that error from any listeners for the es-* events.

ciudadanointeligente/popit-api,Sinar/popit-api,Sinar/popit-api,mysociety/popit-api,mysociety/popit-api