FCREPO-3834 Enable Camel toolbox to send xml records to Solr indexing service

[Surfrdan]

** FCREPO-3834 Enable Camel toolbox to send xml records to Solr indexing service **

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JIRA Ticket: https://fedora-repository.atlassian.net/browse/FCREPO-3834

What does this Pull Request do?

Removes the ldpath related code and replaces the Solr requirement on LDPath with a Solr XSLT transform implementation

What's new?

Replaced LDPath transform with an XSLT based transform which can be supplied per object via the same hasIndexingTransformation as the previous LDPath implementation. Alternatively, if no transofmation is specified, a bare-boines default transform is supplied on the classpathj which replicates the functaionality of the LDPath version.

How should this be tested?

A description of what steps someone could take to:

• Make a call to the solr indexing endpoint and examing the resulting solr document whihc should be indexed on the configured solr core.

Additional Notes:README.md should probably be updated too to reflect the new changes and removal of the LDPath functionality, however, I wasn't sure whether that should wait until after a release as I believe the README.md is the main dicumentation for this repo and relates to the current release.

Interested parties

@fcrepo/committers

[whikloj]

This works just needs a few tweaks.

I do think the default LDPath gave a lot more indexing by default. Perhaps we could try to duplicate that with the default XSLT?

For example, with LDPath the resource

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix fedora: <http://fedora.info/definitions/v4/repository#> .
@prefix ldp: <http://www.w3.org/ns/ldp#> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .

<http://localhost:8080/fcrepo/rest/simple_container>
        dc:title               "A simple container" ;
        fedora:created         "2024-01-16T17:09:14.829081Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
        fedora:lastModified    "2024-01-16T17:09:14.829081Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
        fedora:createdBy       "fedoraAdmin" ;
        fedora:lastModifiedBy  "fedoraAdmin" ;
        rdf:type               ldp:BasicContainer ;
        rdf:type               ldp:Resource ;
        rdf:type               fedora:Resource ;
        rdf:type               ldp:RDFSource ;
        rdf:type               ldp:Container ;
        rdf:type               fedora:Container .

results in

{
   "id":"http://fcrepo:8080/fcrepo/rest/simple_container",
   "createdBy_s":"fedoraAdmin",
   "lastModified_l":1705424954829,
   "created_l":1705424954829,
   "lastModifiedBy_s":"fedoraAdmin",
   "type_ss":["http://fedora.info/definitions/v4/repository#Container",
        "http://fedora.info/definitions/v4/repository#Resource",
        "http://www.w3.org/ns/ldp#BasicContainer",
        "http://www.w3.org/ns/ldp#Container",
        "http://www.w3.org/ns/ldp#RDFSource",
        "http://www.w3.org/ns/ldp#Resource"],
    "title":["A simple container"],
    "_version_":1788267677844766720}]
}

With this PR the same resource (with slightly different created/modified datetimes) results in

{
    "id":"http://fcrepo:8080/fcrepo/rest/simple_container",
    "_version_":1788269396095926272}]
}

[Surfrdan]

I've pushed a number of changes which should address those points.

[whikloj]

👍