ElasticSearch Analyzer and Tokenizer for Emails

Question

I could not find a perfect solution either in Google or ES for the following situation, hope someone could help here.

Suppose there are five email addresses stored under field "email":

1. {"email": "[email protected]"}
2. {"email": "[email protected], [email protected]"}
3. {"email": "[email protected]"}
4. {"email": "[email protected]}
5. {"email": "[email protected]"}

I want to fulfill the following searching scenarios:

[Search -> Receive]

"[email protected]" -> 1,2

"[email protected]" -> 2,4

"[email protected]" -> 5

"john.doe" -> 1,2,3,4

"john" -> 1,2,3,4,5

"gmail.com" -> 1,2

"outlook.com" -> 2,3,4

The first three matchings is a MUST, and for the rest of them the more precise the better. Have already tried different combinations of index/search analyzers, tokenizers, and filters. Also tried to work on the condition for match queries, but did not find an ideal solution, any thought is welcome, and no limit to the mappings, analyzers, or which kind of query to use, thanks.

Answer 1

Mapping:

PUT /test
{
  "settings": {
    "analysis": {
      "filter": {
        "email": {
          "type": "pattern_capture",
          "preserve_original": 1,
          "patterns": [
            "([^@]+)",
            "(\\p{L}+)",
            "(\\d+)",
            "@(.+)",
            "([^-@]+)"
          ]
        }
      },
      "analyzer": {
        "email": {
          "tokenizer": "uax_url_email",
          "filter": [
            "email",
            "lowercase",
            "unique"
          ]
        }
      }
    }
  },
  "mappings": {
    "emails": {
      "properties": {
        "email": {
          "type": "string",
          "analyzer": "email"
        }
      }
    }
  }
}

Test data:

POST /test/emails/_bulk
{"index":{"_id":"1"}}
{"email": "[email protected]"}
{"index":{"_id":"2"}}
{"email": "[email protected], [email protected]"}
{"index":{"_id":"3"}}
{"email": "[email protected]"}
{"index":{"_id":"4"}}
{"email": "[email protected]"}
{"index":{"_id":"5"}}
{"email": "[email protected]"}

Query to be used:

GET /test/emails/_search
{
  "query": {
    "term": {
      "email": "[email protected]"
    }
  }
}