Possibilities for structuring ingested json data using Nifi
You probably want to use the SplitJson processor to split the 6000 record JSON structure into 6000 individual flowfiles. If you need to "inject" the parameter definitions from the top-level response, you can do a ReplaceText or JoltTransformJSON operation to manipulate the individual JSON records. Here is a good article by Yolanda Davis describing how to perform Jolt transforms (JSON -> JSON) in NiFi.
Once you have the individual flowfiles containing a single JSON record, putting them into HBase is very easy. Bryan Bende wrote an article describing the necessary configurations for the PutHBaseJson processor.