const data = [
    {
        "value": "1",
        "_index": "index1",
        "_type": "type1"
    }];

const params = {
    DeliveryStreamName: 'XXX', /* required */
    Records: [/* required */
        {
            Data: JSON.stringify(data[0]) //new Buffer('...') || 'STRING_VALUE' /* Strings will be Base-64 encoded on your behalf */ /* required */
        }
    ]
};
firehose.putRecordBatch(params, (err, data) => {
    if (err) console.log(err, err.stack); // an error occurred
    else console.log(data);           // successful response
});