Custom search command requires | spath to parse JSON fields

[mike-mcgrail]

Adding | spath to every search is not intuitive. While inputs can index JSON fields, search command does not run through pipelines and thus requires | spath to parse.

Potential solution is to create records, iterate through JSON fields and add each key=value to records (e.g. self.add_field(record, k, v)). This introduces two design considerations:

1. _raw needs to be defined to display in search results.
2. Performance and overhead of additional looping.