elastic6-schema.json

{
    "settings": {
      "number_of_shards": 10,
      "number_of_replicas": 0,
      "analysis": {
        "normalizer": {
          "lowercase": {
            "type": "custom",
            "char_filter": [],
            "filter": ["lowercase"]
          }
        }
      }
    },
    "mappings": {
      "_doc": {
        "_source":  {
          "enabled": true
        },
        "properties": {
          "user":   {"type": "keyword", "normalizer": "lowercase"},
          "box":    {"type": "keyword", "normalizer": "lowercase"},
          "uid":    {"type": "integer"},
          "from":   {"type": "text"},
          "sender": {"type": "text"},
          "to":     {"type": "text"},
          "cc":     {"type": "text"},
          "bcc":    {"type": "text"},
          "subject":{"type": "text"},
          "body":   {"type": "text"},
          "message-id":{"type": "keyword"},
          "date":   {
            "type": "date",
            "format": "EEE, d MMM yyyy HH:mm:ss Z||yyyy-MM-dd HH:mm:ss||yyyy-MM-dd"
          }
        }
      }
    }
  }