We can make field value in lowercase at index-time using the below config in transforms.conf Here is the syntax that you can use it. --> For Example: If we want to make source field to lower case then use below syntex INGEST_EVAL = source=lower(source) Fro more info refer -https://docs.splunk.com/Documentation/SplunkCloud/8.2.2203/Data/IngestEval
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