Disable using unsigned_long in scripts

[mayya-sharipova]

Relates to #60050, and #64361

[elasticmachine]

Pinging @elastic/es-search (:Search/Search)

[rjernst]

@mayya-sharipova I believe this also needs a change in UnsignedLongLeafFieldData.getScriptValues() to throw an error? Otherwise using doc['some_unsigned_long_field'] would still return?

[mayya-sharipova]

@rjernst Thanks Ryan, good comment, addressed in fe4409c. Please continue the review, when you have time.

[stu-elastic]

Thanks @mayya-sharipova. The change reverted the added code. I've test that it throws a runtime error when a unsigned_long field is accessed from a script:

    "failed_shards": [
      {
        "shard": 0,
        "index": "ul_test",
        "node": "94nQZ39ZR5SQnah5MN0d_w",
        "reason": {
          "type": "script_exception",
          "reason": "runtime error",
          "script_stack": [
            "org.elasticsearch.xpack.unsignedlong.UnsignedLongLeafFieldData.getScriptValues(UnsignedLongLeafFieldData.java:77)",
            "org.elasticsearch.search.lookup.LeafDocLookup$1.run(LeafDocLookup.java:72)",
            "org.elasticsearch.search.lookup.LeafDocLookup$1.run(LeafDocLookup.java:69)",
            "java.base/java.security.AccessController.doPrivileged(Native Method)",
            "org.elasticsearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:69)",
            "org.elasticsearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:36)",
            "state.sqrd.add(doc.a.value * doc.a.value)",
            "                  ^---- HERE"
          ],
          "script": "state.sqrd.add(doc.a.value * doc.a.value)",
          "lang": "painless",
          "position": {
            "offset": 18,
            "start": 0,
            "end": 41
          },
          "caused_by": {
            "type": "unsupported_operation_exception",
            "reason": "Using unsigned_long in scripts is currently not supported!"
          }
        }
      }
    ]