enable doing raw query based on any fields in the message

[TomasTomecek]

Recently we were trying to find a specific message using datagrepper REST API together with @thrix. So we tried https://.../raw/task?method=buildContainer&topic=... or ?id=1234565 (koji task id). After I browsed the sources I realized that datagrepper doesn't support such dynamic queries. Would it be then possible to add support for queries based on any fields in messages?

I understand this is a complex RFE which would likely require support from the database backend (index every key in the message).

[prcek-prcek]

I second this request. Recently I was trying to workaround it using "contains=" filter, this can be done for one key:value. '%' for arbitrary string can be used, but filtering messages by more fields depends on fields order as you treat messages as strings.
It would be also handy to be able filter according headers name/value as I'm not aware of any method how to do it ATM.

[akostadinov]

Sounds related to #55.