**Build scan:**
https://gradle-enterprise.elastic.co/s/whiwuz23mtmvq/tests/:x-pack:plugin:rollup:test/org.elasticsearch.xpack.rollup.v2.RollupActionSingleNodeTests/testCannotRollupToExistingIndex

**Reproduction line:**
`./gradlew ':x-pack:plugin:rollup:test' --tests "org.elasticsearch.xpack.rollup.v2.RollupActionSingleNodeTests.testCannotRollupToExistingIndex" -Dtests.seed=9814B01249EAC77D -Dtests.locale=en-SG -Dtests.timezone=Africa/Windhoek -Druntime.java=17`

**Applicable branches:**
main

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

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.xpack.rollup.v2.RollupActionSingleNodeTests&tests.test=testCannotRollupToExistingIndex

**Failure excerpt:**
```
org.elasticsearch.index.IndexNotFoundException: no such index [rollup-testcannotrollupwhileotherrollupinprogress-svlo]

  at __randomizedtesting.SeedInfo.seed([9814B01249EAC77D:325B86553CE92325]:0)
  at org.elasticsearch.cluster.metadata.Metadata.getIndexSafe(Metadata.java:919)
  at org.elasticsearch.cluster.metadata.MetadataDeleteIndexService.deleteIndices(MetadataDeleteIndexService.java:89)
  at org.elasticsearch.cluster.metadata.MetadataDeleteIndexService$1.execute(MetadataDeleteIndexService.java:70)
  at org.elasticsearch.cluster.service.MasterService$UnbatchedExecutor.execute(MasterService.java:515)
  at org.elasticsearch.cluster.service.MasterService.innerExecuteTasks(MasterService.java:959)
  at org.elasticsearch.cluster.service.MasterService.executeTasks(MasterService.java:929)
  at org.elasticsearch.cluster.service.MasterService.runTasks(MasterService.java:261)
  at org.elasticsearch.cluster.service.MasterService$Batcher.run(MasterService.java:165)
  at org.elasticsearch.cluster.service.TaskBatcher.runIfNotProcessed(TaskBatcher.java:110)
  at org.elasticsearch.cluster.service.TaskBatcher$BatchedTask.run(TaskBatcher.java:148)
  at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:710)
  at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.runAndClean(PrioritizedEsThreadPoolExecutor.java:257)
  at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:223)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
  at java.lang.Thread.run(Thread.java:833)

```
x-pack/plugin/rollup/src/test/java/org/elasticsearch/xpack/rollup/v2/RollupActionSingleNodeTests.java
Map<String, TimeSeriesParams.MetricType> metricFields = new HashMap<>();
        Map<String, String> labelFields = new HashMap<>();
        MappingVisitor.visitMapping(sourceIndexMappings, (field, fieldMapping) -> {
            if (helper.isTimeSeriesMetric(field, fieldMapping)) {
                metricFields.put(field, TimeSeriesParams.MetricType.valueOf(fieldMapping.get(TIME_SERIES_METRIC_PARAM).toString()));
            } else if (helper.isTimeSeriesLabel(field, fieldMapping)) {
                labelFields.put(field, fieldMapping.get("type").toString());
            }
        });
        assertRollupIndexAggregations(sourceIndex, rollupIndex, config, metricFields, labelFields);
        GetIndexResponse indexSettingsResp = client().admin().indices().prepareGetIndex().addIndices(sourceIndex, rollupIndex).get();
        assertRollupIndexSettings(sourceIndex, rollupIndex, indexSettingsResp);
        Map<String, Map<String, Object>> mappings = (Map<String, Map<String, Object>>) indexSettingsResp.getMappings()
            .get(rollupIndex)
            .getSourceAsMap()
            .get("properties");
        assertFieldMappings(config, metricFields, mappings);
        GetMappingsResponse indexMappings = client().admin()
            .indices()
            .getMappings(new GetMappingsRequest().indices(rollupIndex, sourceIndex))
            .actionGet();
        Map<String, String> rollupIndexProperties = (Map<String, String>) indexMappings.mappings()
            .get(rollupIndex)
            .sourceAsMap()
            .get("properties");
        Map<String, String> sourceIndexCloneProperties = (Map<String, String>) indexMappings.mappings()
            .get(sourceIndex)
            .sourceAsMap()
            .get("properties");
        List<Map.Entry<String, String>> labelFieldRollupIndexCloneProperties = (rollupIndexProperties.entrySet()