14 files declare their use of Cluster in Elasticsearch Connector 8.6

ClientManager.php in src/ElasticSearch/ClientManager.php

ClientManagerInterface.php in src/ElasticSearch/ClientManagerInterface.php

ClientManagerTest.php in tests/src/Unit/ElasticSearch/ClientManagerTest.php

ClusterDeleteForm.php in src/Form/ClusterDeleteForm.php

ClusterForm.php in src/Form/ClusterForm.php

ClusterListBuilder.php in src/Controller/ClusterListBuilder.php

ClusterManagerTest.php in tests/src/Unit/ClusterManagerTest.php

ElasticsearchController.php in src/Controller/ElasticsearchController.php

ElasticsearchViewsQuery.php in modules/elasticsearch_connector_views/src/Plugin/views/query/ElasticsearchViewsQuery.php

elasticsearch_connector_views.views.inc in modules/elasticsearch_connector_views/elasticsearch_connector_views.views.inc

Views hook implementations for the Search API module.

IndexDeleteForm.php in src/Form/IndexDeleteForm.php

IndexFactory.php in src/ElasticSearch/Parameters/Factory/IndexFactory.php

IndexForm.php in src/Form/IndexForm.php

SearchApiElasticsearchBackend.php in src/Plugin/search_api/backend/SearchApiElasticsearchBackend.php