Use any index specified by .watches for Watcher (#39541) #39708
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Previously, Watcher only attached its listener to indices that started with the prefix `.watches`, which causes Watcher to silently fail to schedule newly created Watches if the `.watches` alias is redirected to an index that does not start with `.watches`. Watcher now attaches the listener to all indices, so that Watcher can respond to changes in which index has the `.watches` alias. Also adjusts the tests to randomly use non-prefixed concrete indices for .watches and .triggered_watches.
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Backport of #39541
Previously, Watcher only attached its listener to indices that started
with the prefix
.watches, which causes Watcher to silently fail toschedule newly created Watches if the
.watchesalias is redirected toan index that does not start with
.watches.Watcher now attaches the listener to all indices, so that Watcher can
respond to changes in which index has the
.watchesalias.Also adjusts the tests to randomly use non-prefixed concrete indices for .watches and .triggered_watches.