[8.7](backport #35474) winlogbeat: allow termination while attempting…

… to open channels (#35491)

* winlogbeat: allow termination while attempting to open channels (#35474)

Currently, if winlogbeat is attempting to open a channel that is not
available because it is not found or there is a recoverable error, it
will loop and retry. Since signals have been sent to notification
handlers by this point, cancellation of the loop is not possible without
agreement. So add a cancellation select at the head of the retry loop to
allow termination.

(cherry picked from commit a927de0)

* Update CHANGELOG.next.asciidoc

---------

Co-authored-by: Dan Kortschak <90160302+efd6@users.noreply.github.com>

CHANGELOG.next.asciidoc

@@ -86,6 +86,7 @@ https://github.com/elastic/beats/compare/v8.7.1\...main[Check the HEAD diff]
 
 - Fix crash when processing forwarded logs missing a message. {issue}34705[34705] {pull}34865[34865]
 - Move repeated channel not found errors to debug level.  {issue}35314[35314] {pull}35317[35317]
+- Allow program termination when attempting to open an absent channel. {pull}35474[35474]
 
 *Functionbeat*
 

winlogbeat/beater/eventlogger.go

@@ -136,6 +136,12 @@ func (e *eventLogger) run(
 
 runLoop:
 	for stop := false; !stop; {
+		select {
+		case <-done:
+			return
+		default:
+		}
+
 		err = api.Open(state)
 
 		switch {