https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/io/elasticsearch/ElasticsearchIO.DocToBulk.html
ElasticsearchIO.DocToBulk (Apache Beam 2.73.0)
declaration: package: org.apache.beam.sdk.io.elasticsearch, class: ElasticsearchIO, class: DocToBulk
apache beam