Elasticsearch Index Template

[gittinfunky]

I am following this tutorial and trying to send tshark captures to ELK.

https://www.elastic.co/blog/analyzing-network-packets-with-wireshark-elasticsearch-and-kibana

I am required to create an elasticsearch mapping but am confused as to what this is. Does this mean to create an index template like below

packets-index_pattern.json

PUT _template/packets
{
  "template": "packets-*",
  "mappings": {
"pcap_file": {
  "dynamic": "false",
  "properties": {
    "timestamp": {
      "type": "date"
    },
    "layers": {
      "properties": {
        "frame": {
          "properties": {
            "frame_frame_len": {
              "type": "long"
            },
            "frame_frame_protocols": {
              "type": "keyword"
            }
          }
        },
        "ip": {
          "properties": {
            "ip_ip_src": {
              "type": "ip"
            },
            "ip_ip_dst": {
              "type": "ip"
            }
          }
        },
        "udp": {
          "properties": {
            "udp_udp_srcport": {
              "type": "integer"
            },
            "udp_udp_dstport": {
              "type": "integer"
            }
          }
        }
      }
    }
  }
}
  }
}

So far I have created a file called packets-index_pattern.json and tried to upload it to Elasticsearch using the below, however I get an error saying status 400 curl: (6) could not resolve host: Content-Type

curl -XPUT 'localhost:9200/_template/packets-?pretty' -H 'Content-Type: application/json'

Any help glady accepted