tree 12c9f27280f0f268c86e5016cce9caf12739ded3
parent d74697356121c5ea3be708f2195f2f1cc125c4b1
author Luca Milanesio <luca.milanesio@gmail.com> 1734952928 +0000
committer Luca Milanesio <luca.milanesio@gmail.com> 1734956112 -0800

Reintroduce Forwarded(Batch)IndexExecutor for indexing threads

Introduce the well-known executors with associated queues for
running the reindexing tasks associated with the forwarded tasks
form the HA nodes.
The executors and associated queues were removed in If5ec4a1ed but
the Forwarded(Batch)IndexExecutor class names kept with a different
implementation on top of the async-retry with failsafe.

The well-known executors names, lost during the refactoring
introduced with If5ec4a1ed, which has caused two issues:

a) The indexing tasks were not visible anymore in the executors
   queues, which made problematic managing the queues and giving
   the associated visibility to the Gerrit admin.

b) Other plugins, like multi-site, were unaware that the indexing
   was happening because of the HA index forwarding, generating
   a continuous loop of indexing events between HA and multi-site.

Reintroduce the proper executors in their original class names,
made available thanks to the renaming made in I18cdfcaf,
and add the UsedAt() notation as sentinel for preventing the
executors to be removed unilaterally again.

Change-Id: I7d4735155fb3d84cb445dfd4612bfbe90716766a