Starting Optimize 3.4.0 with the "--upgrade" option fails if schema is already migrated or not existing

Starting Camunda Optimize Upgrade to 3.4.0-RC1...

12:36:08.109 [main] DEBUG o.c.o.u.e.ElasticsearchHighLevelRestClientBuilder - Elasticsearch username and password not provided, skipping connection credential setup.
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: org.camunda.optimize.service.exceptions.OptimizeRuntimeException: Failed retrieving aliases for dynamic index prefix camunda-activity-event-
	at org.camunda.optimize.upgrade.util.MappingMetadataUtil.retrieveAllDynamicIndexKeysForPrefix(MappingMetadataUtil.java:165)
	at org.camunda.optimize.upgrade.util.MappingMetadataUtil.retrieveAllCamundaActivityEventIndices(MappingMetadataUtil.java:117)
	at org.camunda.optimize.upgrade.util.MappingMetadataUtil.getAllDynamicMappings(MappingMetadataUtil.java:149)
	at org.camunda.optimize.upgrade.util.MappingMetadataUtil.getAllMappings(MappingMetadataUtil.java:66)
	at org.camunda.optimize.upgrade.es.SchemaUpgradeClientFactory.createSchemaUpgradeClient(SchemaUpgradeClientFactory.java:37)
	at org.camunda.optimize.upgrade.es.SchemaUpgradeClientFactory.createSchemaUpgradeClient(SchemaUpgradeClientFactory.java:24)
	at org.camunda.optimize.upgrade.main.UpgradeProcedureFactory.create(UpgradeProcedureFactory.java:22)
	at org.camunda.optimize.upgrade.main.UpgradeMain.<clinit>(UpgradeMain.java:37)
Caused by: java.net.ConnectException: Connection refused
	at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:865)
	at org.elasticsearch.client.RestClient.performRequest(RestClient.java:275)
	at org.elasticsearch.client.RestClient.performRequest(RestClient.java:262)
	at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1628)
	at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1598)
	at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1568)
	at org.elasticsearch.client.IndicesClient.getAlias(IndicesClient.java:1315)
	at org.camunda.optimize.service.es.OptimizeElasticsearchClient.getAlias(OptimizeElasticsearchClient.java:146)
	at org.camunda.optimize.upgrade.util.MappingMetadataUtil.retrieveAllDynamicIndexKeysForPrefix(MappingMetadataUtil.java:161)
	... 7 more
Caused by: java.net.ConnectException: Connection refused
	at java.base/sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
	at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:779)
	at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvent(DefaultConnectingIOReactor.java:174)
	at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvents(DefaultConnectingIOReactor.java:148)
	at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:351)
	at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.execute(PoolingNHttpClientConnectionManager.java:221)
	at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase$1.run(CloseableHttpAsyncClientBase.java:64)
	at java.base/java.lang.Thread.run(Thread.java:834)

Starting Camunda Optimize Upgrade to 3.4.0-RC1...

12:36:24.367 [main] DEBUG o.c.o.u.e.ElasticsearchHighLevelRestClientBuilder - Elasticsearch username and password not provided, skipping connection credential setup.
12:36:25.239 - Elasticsearch exception [type=index_not_found_exception, reason=no such index [optimize-decision-instance]]
org.elasticsearch.ElasticsearchStatusException: Elasticsearch exception [type=index_not_found_exception, reason=no such index [optimize-decision-instance]]
	at org.elasticsearch.rest.BytesRestResponse.errorFromXContent(BytesRestResponse.java:187)
	at org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:1907)
	at org.elasticsearch.client.RestHighLevelClient.parseResponseException(RestHighLevelClient.java:1884)
	at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1641)
	at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1598)
	at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1568)
	at org.elasticsearch.client.RestHighLevelClient.search(RestHighLevelClient.java:1084)
	at org.camunda.optimize.service.es.OptimizeElasticsearchClient.search(OptimizeElasticsearchClient.java:216)
	at org.camunda.optimize.upgrade.plan.factories.Upgrade33To34PlanFactory.getAllExistingDefinitionKeys(Upgrade33To34PlanFactory.java:395)
	at org.camunda.optimize.upgrade.plan.factories.Upgrade33To34PlanFactory.createUpgradePlan(Upgrade33To34PlanFactory.java:81)
	at org.camunda.optimize.upgrade.plan.UpgradePlanRegistry.lambda$new$0(UpgradePlanRegistry.java:35)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
	at org.camunda.optimize.upgrade.plan.UpgradePlanRegistry.<init>(UpgradePlanRegistry.java:31)
	at org.camunda.optimize.upgrade.main.UpgradeMain.main(UpgradeMain.java:51)
	Suppressed: org.elasticsearch.client.ResponseException: method [POST], host [http://elasticsearch:9200], URI [/optimize-decision-instance/_search?typed_keys=true&max_concurrent_shard_requests=5&ignore_unavailable=false&expand_wildcards=open&allow_no_indices=true&ignore_throttled=true&search_type=query_then_fetch&batched_reduce_size=512&ccs_minimize_roundtrips=true], status line [HTTP/1.1 404 Not Found]
{"error":{"root_cause":[{"type":"index_not_found_exception","reason":"no such index [optimize-decision-instance]","resource.type":"index_or_alias","resource.id":"optimize-decision-instance","index_uuid":"_na_","index":"optimize-decision-instance"}],"type":"index_not_found_exception","reason":"no such index [optimize-decision-instance]","resource.type":"index_or_alias","resource.id":"optimize-decision-instance","index_uuid":"_na_","index":"optimize-decision-instance"},"status":404}
		at org.elasticsearch.client.RestClient.convertResponse(RestClient.java:318)
		at org.elasticsearch.client.RestClient.performRequest(RestClient.java:288)
		at org.elasticsearch.client.RestClient.performRequest(RestClient.java:262)
		at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1628)
		... 10 common frames omitted