Improve JSON data exploring by adding Collection Filter and improve search

[josvanroosmalen]

Currently there seems to be some issues with JSON documents:

• DHF JSON data cannot be discriminated correctly. Typically a flat JSON has no root element. DHF output (staging/final) has always an /envelope a header and instance, etc. You cannot discriminate on this.

SOLUTION Rename "Type Discriminator" to "Path Filter". I will add a "Collection Filter" which is able to select 1 collection. For example for DHF you can then typically select the Flow collection name.

• JSON search is not working on correctly. If I create a new JSON query based on DB sampling, and choice "/envelope" (or /), then the search yield 0 documents even if there are documents in scope.

SOLUTION Needs Investigation. First I thought this was right related. However I now think the JSON search was or never correctly implemented (I worked on JSON support early this year) or this was later introduced as regression issue.

[josvanroosmalen]

@damonfeldman @markschiffner I will first investigate master, to investigate the second issue (search not working correctly). Once found, I will update this issue, and create a separate branch to start working on this.