@AlokKumar
I am not 100% clear on yoru use case. NiFi can interface with the Soap API using the invokeHTTP processor, but I am not clear on what you men by sending soap request to NiFi to be processed and returned?
Can you provide more detail?
Maybe you can use HandleHTTPRequest in NiFi to receive yoru request, pass that to an invokeHTTP processor to interact with the Soap API and get a response which is sent to the the HandleHTTPResponse processor that responds to the original request.
For more on the invokeHTTP interfacing with Soap API, here is a possible useful post:
https://stackoverflow.com/questions/49457764/nifi-how-to-use-invokehttp-processor-with-soap
Apparently someone also created a soap processor you could try:
https://github.com/apsaltis/nifi-soap
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Thank you,
Matt