我还没有测试过这个，但是你可以检查一下这个是否有帮助
备选案文1：

List<String> ids = new ArrayList<>();
    ids.add("1");
    ids.add("2");
    for (String id : ids) {
        UpdateRequest updateRequest = new UpdateRequest();
        updateRequest.index("index");
        updateRequest.type("_doc");
        updateRequest.id("1");
        updateRequest.doc(jsonBuilder().startObject().field("gender", "male").endObject());
        bulkRequest.add(updateRequest);
    }
    BulkResponse bulkResponse = bulkRequest.execute().actionGet();

选项2：使用脚本

List<String> ids = new ArrayList<>();
    ids.add("1");
    ids.add("2");
    Map<String, Object> params = new HashMap<>();
    String scriptCode = "ctx._source.gender=params.gender";
    params.put("gender", "male");
    BulkRequestBuilder bulkRequest = client.prepareBulk();
    for(String id : ids) {
        UpdateRequestBuilder updateRequestBuilder = client.prepareUpdate("index", "type", id)
                .setScript(new Script(ScriptType.INLINE, "painless", scriptCode, params));
        bulkRequest.add(updateRequestBuilder);
    }
    BulkResponse bulkResponse = bulkRequest.execute().actionGet();