ElasticsearchSnapshotQueryBackendFactory
constructor(elasticsearchClient: ReactiveElasticsearchClient, queryBatchSize: Int = DEFAULT_SEARCH_BATCH_SIZE, queryKeepAlive: Duration = DEFAULT_PIT_KEEP_ALIVE, indexMappingResolver: ElasticsearchIndexMappingResolver = ElasticsearchIndexMappingResolver(elasticsearchClient), schemaSources: List<QuerySchemaSource> = emptyList())