Indexed data vanishes after few hours and cause 0 events for 2 3 hours time frame in a day

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I have a Clustered environment and monitoring setup for application logs,universal forwarders push data to indexers .
Lately , I have been facing issue where the application logs are getting indexed and available .
But after few hours when I search for the present day logs on splunk there are 0 events for 2 3 hours time frame and indexed data vanishes.

Not sure if this is a known issue , any help would be of much help.

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