It looks like this suite timed out because a node of the backing cluster exploded. Looks like an assertion was tripped.

```
» [2023-10-09T21:16:07,555][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [v8.8.2-2] fatal error in thread [elasticsearch[v8.8.2-2][clusterApplierService#updateTask][T#1]], exiting java.lang.AssertionError: provided source [{"_doc":{"_data_stream_timestamp":{"enabled":true},"_source":{"mode":"synthetic"},"properties":{"@timestamp":{"type":"date"},"key":{"type":"keyword","time_series_dimension":true}}}}] differs from mapping [{"_doc":{"_data_stream_timestamp":{"enabled":true},"properties":{"@timestamp":{"type":"date"},"key":{"type":"keyword","time_series_dimension":true}}}}]
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.index.mapper.DocumentMapper.<init>(DocumentMapper.java:42)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.index.mapper.MapperService.newDocumentMapper(MapperService.java:376)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.index.mapper.MapperService.updateMapping(MapperService.java:285)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.index.IndexService.updateMapping(IndexService.java:700)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.indices.cluster.IndicesClusterStateService.createIndicesAndUpdateShards(IndicesClusterStateService.java:493)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.indices.cluster.IndicesClusterStateService.applyClusterState(IndicesClusterStateService.java:250)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.cluster.service.ClusterApplierService.callClusterStateAppliers(ClusterApplierService.java:536)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.cluster.service.ClusterApplierService.callClusterStateAppliers(ClusterApplierService.java:522)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.cluster.service.ClusterApplierService.applyChanges(ClusterApplierService.java:495)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.cluster.service.ClusterApplierService.runTask(ClusterApplierService.java:426)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.cluster.service.ClusterApplierService$UpdateTask.run(ClusterApplierService.java:154)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:916)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.runAndClean(PrioritizedEsThreadPoolExecutor.java:217)
»  	at org.elasticsearch.server@8.8.2/org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:183)
»  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
»  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
»  	at java.base/java.lang.Thread.run(Thread.java:1623)
»  
»  
»  ERROR: Elasticsearch exited unexpectedly
```

**Build scan:**
https://gradle-enterprise.elastic.co/s/bte5oskoqsjl6/tests/:qa:mixed-cluster:v8.8.2%23mixedClusterTest/org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT
**Reproduction line:**
```
null
```

**Applicable branches:**
main

**Reproduces locally?:**
Didn't try

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT&tests.test=classMethod
**Failure excerpt:**
```
java.lang.Exception: Suite timeout exceeded (>= 2400000 msec).

  at __randomizedtesting.SeedInfo.seed([E230389699262455]:0)

```
server/src/test/java/org/elasticsearch/index/query/SearchExecutionContextTests.java
assertFalse(context.indexSortedOnField("second_sort_field"));
        assertFalse(context.indexSortedOnField("non_sort_field"));
    }
    public void testFielddataLookupSelfReference() {
        SearchExecutionContext searchExecutionContext = createSearchExecutionContext(
            
            runtimeField("field", leafLookup -> leafLookup.doc().get("field").toString())
        );
        IllegalArgumentException iae = expectThrows(IllegalArgumentException.class, () -> collect("field", searchExecutionContext));
        assertEquals("Cyclic dependency detected while resolving runtime fields: field -> field", iae.getMessage());
    }
    public void testFielddataLookupLooseLoop() {
        SearchExecutionContext searchExecutionContext = createSearchExecutionContext(
            
            runtimeField("1", leafLookup -> leafLookup.doc().get("2").get(0).toString()),
            runtimeField("2", leafLookup -> leafLookup.doc().get("3").get(0).toString()),
            runtimeField("3", leafLookup -> leafLookup.doc().get("4").get(0).toString()),
            runtimeField("4", leafLookup -> leafLookup.doc().get("1").get(0).toString())
        );
        IllegalArgumentException iae = expectThrows(IllegalArgumentException.class, () -> collect("1", searchExecutionContext));
        assertEquals("Cyclic dependency detected while resolving runtime fields: 1 -> 2 -> 3 -> 4 -> 1", iae.getMessage());
    }
    public void testFielddataLookupTerminatesInLoop() {
        SearchExecutionContext searchExecutionContext = createSearchExecutionContext(
            
            runtimeField("1", leafLookup -> leafLookup.doc().get("2").get(0).toString()),
            runtimeField("2", leafLookup -> leafLookup.doc().get("3").get(0).toString()),
            runtimeField("3", leafLookup -> leafLookup.doc().get("4").get(0).toString()),
            runtimeField("4", leafLookup -> leafLookup.doc().get("4").get(0).toString())
        );