email_aware_04-01.py

PUT courses-03/
{
  "settings": {
    "analysis": {
      "char_filter": {
        "email_dot_replacer": {
          "type": "mapping",
          "mappings": [
            ". => -"
          ]
        }
      },
      "analyzer": {
        "ana_email_fixer": {
          "type": "custom",
          "char_filter": [ "email_dot_replacer" ],
          "tokenizer": "standard",
          "filter": [ "lowercase" ]
        },
        "email_extractor": {
          "tokenizer": "uax_url_email",
          "filter": [ "lowercase" ]
        }
      }
    }
  },
  "mappings": {
    "properties": {
      "comments": {
        "type": "text",
        "analyzer": "email_extractor",
        "fields": {
          "email": {
            "type": "text",
            "analyzer": "ana_email_fixer"
          }
        }
      }
    }
  }
}

/* test */
POST courses-03/_analyze
{
  "analyzer": "email_extractor",
  "text": ["if you think the course is nice and wanna comment, please send an email to -> donna.karen@uni.gov or jojo.star.crusade@uni.gov . Thx~"]
}

...
/* result */
{
  "tokens" : [
    {
      "token" : "if",
      "start_offset" : 0,
      "end_offset" : 2,
      "type" : "<ALPHANUM>",
      "position" : 0
    },
    ...
    {
      "token" : "donna.karen@uni.gov",
      "start_offset" : 78,
      "end_offset" : 97,
      "type" : "<EMAIL>",
      "position" : 15
    },
    ...
    {
      "token" : "jojo.star.crusade@uni.gov",
      "start_offset" : 101,
      "end_offset" : 126,
      "type" : "<EMAIL>",
      "position" : 17
    }
    ...
  ]
}