Bulk Index for employees

bulk_index.ndjson

{"index": {"_index": "employees","_type": "_doc","_id": "1"}}
{"employee": "Emp 01","city": "Chicago","age": 24}
{"index": {"_index": "employees","_type": "_doc","_id": "2"}}
{"employee": "Emp 02","city": "San Francisco","age": 26}
{"index": {"_index": "employees","_type": "_doc","_id": "3"}}
{"employee": "Emp 03","city": "San Francisco","age": 28}
{"index": {"_index": "employees","_type": "_doc","_id": "4"}}
{"employee": "Emp 04","city": "San Francisco","age": 30}
{"index": {"_index": "employees","_type": "_doc","_id": "5"}}
{"employee": "Emp 05","city": "San Francisco","age": 32}
{"index": {"_index": "employees","_type": "_doc","_id": "6"}}
{"employee": "Emp 06","city": "Chicago","age": 34}
{"index": {"_index": "employees","_type": "_doc","_id": "7"}}
{"employee": "Emp 07","city": "Chicago","age": 36}
{"index": {"_index": "employees","_type": "_doc","_id": "8"}}
{"employee": "Emp 08","city": "Chicago","age": 38}
{"index": {"_index": "employees","_type": "_doc","_id": "9"}}
{"employee": "Emp 09","city": "Amsterdam","age": 40}
{"index": {"_index": "employees","_type": "_doc","_id": "10"}}
{"employee": "Emp 10","city": "Madrid","age": 42}
{"index": {"_index": "employees","_type": "_doc","_id": "11"}}
{"employee": "Emp 11","city": "Amsterdam","age": 44}
{"index": {"_index": "employees","_type": "_doc","_id": "12"}}
{"employee": "Emp 12","city": "Chicago","age": 46}