Muting SparseVectorQueryBuilderTests.testToQuery (#117998)

Author: masseyke

muted-tests.yml

@@ -414,3 +414,6 @@ tests:
   issue: https://github.com/elastic/elasticsearch/issues/117862
 - class: org.elasticsearch.xpack.security.authc.ldap.UserAttributeGroupsResolverTests
   issue: https://github.com/elastic/elasticsearch/issues/116537
+- class: org.elasticsearch.xpack.core.ml.search.SparseVectorQueryBuilderTests
+  method: testToQuery
+  issue: https://github.com/elastic/elasticsearch/issues/117998