[Backport 2.x] Support script score when doc value is disabled and fix misusing DISI

[opensearch-trigger-bot]

Backport 4d59d4c from #1696

[jmazanec15]

Flaky recall issue:

org.opensearch.knn.recall.RecallTestsIT > testRecall_whenFaissHnswFP32_thenRecallAbove75percent FAILED
    java.lang.AssertionError: expected:<1.0> but was:<0.7483000183105468>
REPRODUCE WITH: ./gradlew ':integTest' --tests "org.opensearch.knn.recall.RecallTestsIT.testRecall_whenFaissHnswFP32_thenRecallAbove75percent" -Dtests.seed=43FD3FA61FB30388 -Dtests.security.manager=false -Dtests.locale=no -Dtests.timezone=America/Ojinaga -Druntime.java=17
        at __randomizedtesting.SeedInfo.seed([43FD3FA61FB30388:A38956C81BBCF7D]:0)
        at org.junit.Assert.fail(Assert.java:89)
        at org.junit.Assert.failNotEquals(Assert.java:835)
        at org.junit.Assert.assertEquals(Assert.java:555)
        at org.junit.Assert.assertEquals(Assert.java:685)
        at org.opensearch.knn.recall.RecallTestsIT.assertRecall(RecallTestsIT.java:476)
        at org.opensearch.knn.recall.RecallTestsIT.testRecall_whenFaissHnswFP32_thenRecallAbove75percent(RecallTestsIT.java:255)

Will create issue. Not related to this PR