Read-only Solr queries through admin interface

[srerickson]

The ability to run arbitrary read-only queries against the Solr index will be important for current and future metadata remediation projects. This doesn't need to be a fancy UI: just some ability to submit queries and get raw results from the index.

I know @whereismyjetpack has thoughts on how to implement this. Also related to #1588

[mtribone]

We are unable to provide librarians direct access to the Solr core. We would need to provide a layer in the SS admin interface, so that we are not interrupting the development workflow and empowering others to obtain rich reporting.

Notes (core dump):
Ask a question and get an answer
Dump out JSON
For example the 5175 metadata remediation file. Copy the Solr query interface in the admin interface but it is just a GET.

Data harvesting for faceted items
explore some tools that help librarians research and explore the data

[awead]

Fixed with https://servicedesk.css.psu.edu/browse/APPINT-3011