How to achieve bulk indexing "asynchronously" through REST API (not through RestHighClient)

One can achieve bulk indexing "Asynchronously" through REST Java High Client. As mentioned here:
https://www.elastic.co/guide/en/elasticsearch/client/java-rest/master/java-rest-high-document-bulk.html

But do anyone know what parameters shall I pass to achieve "asynchronous" bulk indexing through REST API? (_bulk Rest API)?

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