Here is the code that can enable to upload bulk upload,
CloudantClient client = ClientBuilder.account("accounbt")
.username("username").password("password")
.disableSSLAuthentication().build();*/
Database db = client.database("databaseName", true);
List<JSONObject> arrayJson = new ArrayList<String>();
arrayJson.add(new JSONObject("{data:hello}"));
arrayJson.add(new JSONObject("{data:hello1}"));
arrayJson.add(new JSONObject("{data:hello2}"));
db.bulk(arrayJson);
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solved How to save bulk document in Cloudant using Java or Spark – Java?