@NagendraKumar 

This is not something I have messed with much.   The GrokReader is what would be commonly used to parse unstructured data. Your data looks similar to Cisco syslog structure.  While the GrokReader has built in pattern file, you may find yourself needing to define a custom pattern file for your specific data.  You might find this other community post helpful here:
https://community.cloudera.com/t5/Support-Questions/ExtractGrok-processor-Writing-Regex-to-parse-Cis...

Hopefully you can use the pattern file example provided through the github post form that other community thread to help create a custom pattern file that works for your specific data:
https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-proce...

Hope you find this information helps you with your use case journey.

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Thank you,
Matt