[7.6] Handle errors when evaluating if conditions in processors #52639
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In certain ingest pipelines, any failures when evaluating the condition for an
if
clause would result in partial execution of both the success and failure handlers for the processor. This manifested as a double decrement of theingestCurrent
processor metric which, once it went negative, could no longer be serialized as a non-negativelong
.Backport of #52543.