Search: dataverse alias not searchable

[pdurbin]

Originally reported by @mcrosas and mentioned at #1928 (comment)

A search for https://dataverse.harvard.edu/?q=datapass (sadly) does not find https://dataverse.harvard.edu/dataverse/datapass . This is on v. 4.2.3 build 55-6561f58

I believe the reason for this is that dataverse aliases are indexed under the Solr field identifier and this field is not copied to the "catchall" Solr field ("text").

However, this field is a string type rather than a text_en...

<field name="identifier" type="string" stored="true" indexed="true" multiValued="false"/>

... so we may not want to simply copy it as is like this:

<copyField source="identifier" dest="text" maxChars="3000"/>

Rather, we might want to create and copy a text_en version instead specific to dataverse aliases for friendlier matches.

In fact, identifier is also used for dataset persistent IDs and file (database) IDs, so we almost certainly don't want to blindly copy identifier into the catchall.

Note: I realize this description is a bit dodgy but I'll clean it up later.

[pdurbin]

I've often considered bringing up this issue during backlog grooming, including today, but it never seems important enough or to affect enough users to warrant it. I'm closing it but if someone wants to open a fresh one and advocate that this be fixed, please go ahead. 😄

[pdurbin]

Oh good, @pameyer opened #5011 which is the same feature request.