[9.1] Backporting Fixed RRF YAML REST Test: rrf with pinned retriever as a sub-retriever (#131318)

* Resolved conflicts

* Merge conflict resulted in unnecessary files

Author: mridula-s109

muted-tests.yml

@@ -486,9 +486,6 @@ tests:
 - class: org.elasticsearch.qa.verify_version_constants.VerifyVersionConstantsIT
   method: testLuceneVersionConstant
   issue: https://github.com/elastic/elasticsearch/issues/125638
-- class: org.elasticsearch.xpack.rank.rrf.RRFRankClientYamlTestSuiteIT
-  method: test {yaml=rrf/950_pinned_interaction/rrf with pinned retriever as a sub-retriever}
-  issue: https://github.com/elastic/elasticsearch/issues/129845
 - class: org.elasticsearch.gradle.internal.InternalDistributionBwcSetupPluginFuncTest
   method: "builds distribution from branches via archives extractedAssemble [bwcDistVersion: 8.2.1, bwcProject: bugfix, expectedAssembleTaskName:
     extractedAssemble, #2]"

x-pack/plugin/rank-rrf/src/yamlRestTest/resources/rest-api-spec/test/rrf/950_pinned_interaction.yml

@@ -80,7 +80,7 @@ setup:
                 -
                   standard:
                     query:
-                      match: { text: "document" }
+                      match_none: {}
                 -
                   pinned:
                     ids: ["doc4", "doc5"]
@@ -90,9 +90,6 @@ setup:
                           match: { text: "document" }
 
   - match: { hits.total.value: 5 }
-  - match: { hits.hits.0._id: doc1 }
-  - lt: { hits.hits.0._score: 100.0 }
-  - match: { hits.hits.1._id: doc4 }
-  - match: { hits.hits.2._id: doc5 }
-
+  - match: { hits.hits.0._id: doc4 }
+  - match: { hits.hits.1._id: doc5 }