Add object file names to the index for display in the UI

[laurenwalker]

When the web UI will be references other DataONE objects in the provenance statements, it will be helpful to the user to have a name or title for every object instead of an ID, which can be verbose and unidentifiable.

[sycao5]

@lauren-walker @csjx
Can we close this issue now? If not, what the remaining work need to complete?

[csjx]

@lauren-walker @sycao5 So I think this is resolved since we are using the V2 API classes, and in particular SystemMetadata where we are populating the fileName field. This field is indexed by Solr. Please close if you agree Lauren.

[sycao5]

The file name is stored in 'SystemMetadata'. Close this issue.