Courier Fetch: 3 out of 33 shards failed

Elastic Stack Elasticsearch
6 
GET /logstash-demo-all-*/_mapping

          "request_date": {
            "type": "date"
          },
          "request_departure_date": {
            "type": "date"
          },
          "request_departure_station_code": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },