I noticed that Splunk official suggested us to keep the Indexer and UF using the same version (I am using 6.2.3). However, due to some issue, I need to upgrade the UF to 6.2.6 or 6.3. So doing, any compatibility issue will be introduced?
No. This is spelled out in the docs: http://docs.splunk.com/Documentation/Splunk/6.3.3/Forwarding/Compatibilitybetweenforwardersandindexe...
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Thanks Acharlieh !!