test: temporarily mute tests involving subobjects

Author: mromaios

muted-tests.yml

@@ -540,6 +540,16 @@ tests:
 - class: org.elasticsearch.versioning.ConcurrentSeqNoVersioningIT
   method: testSeqNoCASLinearizability
   issue: https://github.com/elastic/elasticsearch/issues/117249
+- class: org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT
+  issue: https://github.com/elastic/elasticsearch/issues/138649
+  methods:
+    - test {p0=index/92_metrics_auto_subobjects/Metrics object indexing}
+    - test {p0=index/92_metrics_auto_subobjects/Root without subobjects with synthetic source}
+    - test {p0=index/92_metrics_auto_subobjects/Metrics object indexing with synthetic source}
+    - test {p0=indices.put_index_template/15_composition/Composable index templates that include subobjects: auto at root}
+    - test {p0=search/330_fetch_fields/Test with subobjects: auto}
+    - test {p0=indices.put_index_template/15_composition/Composable index templates that include subobjects: auto on arbitrary field}
+    - test {p0=index/92_metrics_auto_subobjects/Root with metrics}
 
 # Examples:
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