C# nest elasticsearch converting guid into array

Question

enter image description here I am doing an aggregation on a field with the a guid value like c4b0c9ae-345c-4247-87e3-e9d9de67c01b but when elastic search returns the aggregations it is becoming an array ["c4b0c9ae","345c","4247","87e3","e9d9de67c01b"]. How do you handle this on nest?

Answer 1

The field has been mapped as a text datatype which undergoes analysis at index time, by default using the Standard Analyzer . The result is that the GUID is tokenized into the constituent parts by splitting on hyphens. You can see this for yourself using the Analyze API (in Kibana Console)

GET _analyze
{
    "analyzer": "standard",
    "text": ["c4b0c9ae-345c-4247-87e3-e9d9de67c01b"]
}

yields

{
   "tokens": [
      {
         "token": "c4b0c9ae",
         "start_offset": 0,
         "end_offset": 8,
         "type": "<ALPHANUM>",
         "position": 0
      },
      {
         "token": "345c",
         "start_offset": 9,
         "end_offset": 13,
         "type": "<ALPHANUM>",
         "position": 1
      },
      {
         "token": "4247",
         "start_offset": 14,
         "end_offset": 18,
         "type": "<NUM>",
         "position": 2
      },
      {
         "token": "87e3",
         "start_offset": 19,
         "end_offset": 23,
         "type": "<ALPHANUM>",
         "position": 3
      },
      {
         "token": "e9d9de67c01b",
         "start_offset": 24,
         "end_offset": 36,
         "type": "<ALPHANUM>",
         "position": 4
      }
   ]
}

You probably don't want to analyze GUIDs at index time, so you should explicitly map them as keyword datatype .