[AWS] Update AWS cloud.region parsing #4024
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What does this PR do?
The AWS-S3 input sets the
cloud.regionfield to the region the S3 bucket is located. This is not always the same as the region the event originated per https://discuss.elastic.co/t/filebeat-aws-cloudtrail-processor-parses-incorrect-aws-region-from-logs/312150. The current ingest pipelines only use a rename processor which doesn't work if the field already exists. This changes the processor a set to override from the input. Also adds additional parsing for datastreams that don't already havecloud.regionset.Checklist
changelog.ymlfile.Author's Checklist
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