Errors related to targeting/relevance in Elastic Search

I’ve noticed similar errors to this in some of the Bloomreach Experience Manager over time but recently these began happening very consistently about every 3-4 seconds. I can’t find much details on troubleshooting specific Elastic Search errors other than connection issues in the Relevance Module Troubleshooting documentation but although I’m also seeing blank data in the Trend tab the cause doesn’t seem to be a java.net.ConnectException: Connection refused error. Any pointers on where to look or what to do next to resolve this would be appreciated. This instance is using on HippoCMS/brXM v12.6.10.

18.06.2021 12:20:51 ERROR pool-22-thread-1 [TargetingJob.run:98] Job /targeting:targeting/targeting:dataflow/modelTrainer failed
com.onehippo.cms7.targeting.storage.RuntimeDataStoreException: Failed to create targeting:visits
        at com.onehippo.cms7.targeting.DataStoreKeeper.creationSeriouslyFailed(DataStoreKeeper.java:217) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.DataStoreKeeper.tryToCreateStore(DataStoreKeeper.java:151) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.DataStoreKeeper.lambda$get$0(DataStoreKeeper.java:86) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_292]
Caused by: com.onehippo.cms7.targeting.storage.DataStoreCreationException: Failed to upload mapping
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.updateMapping(AbstractElasticStore.java:213) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.initialize(AbstractElasticStore.java:117) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.<init>(AbstractElasticStore.java:105) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.ElasticVisitStore.<init>(ElasticVisitStore.java:162) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.ElasticStoreFactory.createVisitStore(ElasticStoreFactory.java:139) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.profiling.ProfilingDataStoreFactory.createVisitStore(ProfilingDataStoreFactory.java:54) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.DataStoreServiceImpl.createVisitStore(DataStoreServiceImpl.java:356) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.DataStoreKeeper.tryToCreateStore(DataStoreKeeper.java:143) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        ... 2 more
Caused by: java.io.IOException: {"root_cause":[{"type":"remote_transport_exception","reason":"[HOSTNAME123][10.100.192.57:9302][indices:admin/mapping/put]"}],"type":"illegal_argument_exception","reason":"object mapping [requests] can't be changed from non-nested to nested"}
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.validateResultIsSuccessful(AbstractElasticStore.java:219) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.updateMapping(AbstractElasticStore.java:206) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.initialize(AbstractElasticStore.java:117) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.<init>(AbstractElasticStore.java:105) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.ElasticVisitStore.<init>(ElasticVisitStore.java:162) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.ElasticStoreFactory.createVisitStore(ElasticStoreFactory.java:139) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.profiling.ProfilingDataStoreFactory.createVisitStore(ProfilingDataStoreFactory.java:54) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.DataStoreServiceImpl.createVisitStore(DataStoreServiceImpl.java:356) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.DataStoreKeeper.tryToCreateStore(DataStoreKeeper.java:143) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        ... 2 more
...skipping...
        at com.onehippo.cms7.targeting.storage.elastic5.ElasticStoreFactory.createVisitStore(ElasticStoreFactory.java:139) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.profiling.ProfilingDataStoreFactory.createVisitStore(ProfilingDataStoreFactory.java:54) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.DataStoreServiceImpl.createVisitStore(DataStoreServiceImpl.java:356) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.DataStoreKeeper.tryToCreateStore(DataStoreKeeper.java:143) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        ... 2 more
Caused by: java.io.IOException: {"root_cause":[{"type":"remote_transport_exception","reason":"[HOSTNAME123][10.100.192.57:9302][indices:admin/mapping/put]"}],"type":"illegal_argument_exception","reason":"object mapping [requests] can't be changed from non-nested to nested"}
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.validateResultIsSuccessful(AbstractElasticStore.java:219) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.updateMapping(AbstractElasticStore.java:206) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.initialize(AbstractElasticStore.java:117) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.AbstractElasticStore.<init>(AbstractElasticStore.java:105) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.ElasticVisitStore.<init>(ElasticVisitStore.java:162) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.elastic5.ElasticStoreFactory.createVisitStore(ElasticStoreFactory.java:139) ~[hippo-addon-targeting-state-elastic5-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.storage.profiling.ProfilingDataStoreFactory.createVisitStore(ProfilingDataStoreFactory.java:54) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.DataStoreServiceImpl.createVisitStore(DataStoreServiceImpl.java:356) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        at com.onehippo.cms7.targeting.DataStoreKeeper.tryToCreateStore(DataStoreKeeper.java:143) ~[hippo-addon-targeting-engine-5.6.10-1.jar:5.6.10-1]
        ... 2 more