Fix flakiness on YAML tests for Sparse Vector (#137202)

* add indices to deletion on teardown

* unmute test (only the 1 is muted)

Author: markjhoy

muted-tests.yml

@@ -489,9 +489,6 @@ tests:
 - class: org.elasticsearch.xpack.esql.qa.mixed.FieldExtractorIT
   method: testTextFieldWithKeywordSubfield {STORED}
   issue: https://github.com/elastic/elasticsearch/issues/136918
-- class: org.elasticsearch.xpack.test.rest.XPackRestIT
-  method: test {p0=ml/sparse_vector_search/Test sparse_vector search with query vector and pruning config}
-  issue: https://github.com/elastic/elasticsearch/issues/136061
 - class: org.elasticsearch.xpack.esql.optimizer.rules.logical.HoistRemoteEnrichTopNTests
   method: testTopNSortExpressionWithinRemoteEnrichAliasing
   issue: https://github.com/elastic/elasticsearch/issues/136957

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/ml/sparse_vector_search.yml

@@ -99,7 +99,7 @@ teardown:
         Authorization: "Basic eF9wYWNrX3Jlc3RfdXNlcjp4LXBhY2stdGVzdC1wYXNzd29yZA==" # run as x_pack_rest_user, i.e. the test setup superuser
         Content-Type: application/json
       indices.delete:
-        index: ["sparse_vector_pruning_test", "test-sparse-vector-without-pruning", "test-sparse-vector-with-pruning"]
+        index: [ "index-with-sparse-vector", "sparse_vector_pruning_test", "test-sparse-vector-without-pruning", "test-sparse-vector-with-pruning", "test-sparse-vector-pruning-default" ]
         ignore: 404
   - do:
       headers: