Cherry-pick #18854 to 7.7: Make selector string casing configurable #19175
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Add support for configuring the string casing in the index/pipeline/key/topic 'Selector'. Elasticsearch pipeline and index names are required to be lower case only. When used with fields from events this was not always guaranteed, leading us to enforce lower case always (elastic#16081. elastic#6342). As the code is reused for Kafka topic selection, this unfortunately did lead to a Regression as some users expect strings to allow mixed case (elastic#18640). With this PR Elasticsearch related resources (e.g. index or pipeline names) are set to lowercase only, while not touching the strings in other outputs. (cherry picked from commit 28f7aca)
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Cherry-pick of PR #18854 to 7.7 branch. Original message:
What does this PR do?
Add support for configuring the string casing in the index/pipeline/key/topic 'Selector'.
Why is it important?
Elasticsearch pipeline and index names are required to be lower case only. When used with fields from events this was not always guaranteed, leading us to enforce lower case always (#16081. #6342).
As the code is reused for Kafka topic selection, this unfortunately did lead to a Regression as some users expect strings to allow mixed case (#18640).
With this PR Elasticsearch related resources (e.g. index or pipeline names) are set to lowercase only, while not touching the strings in other outputs.
Checklist
- [ ] I have made corresponding changes to the documentation- [ ] I have made corresponding change to the default configuration filesCHANGELOG.next.asciidocorCHANGELOG-developer.next.asciidoc.How to test this PR locally
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