Query on _id field

Elastic Stack Elasticsearch
1

I had some trouble trying to query the id_ field

The following query works:

GET my_index/my_type/_search
{
   "query" : {
     "match":{
        "_id": "ABC_my_content1"
     }
   }
}

But what if I want to search for all the document that has the _id start with ABC?
This does not work:

GET my_indxe/my_type/_search
{
   "query" :{
     "query_string" : {
         "default_field" : "_id",
         "query" : "ABC*"
      }
   }
}

I got the error
Can only use prefix queries on keyword and text fields - not on [_id] which is of type [_id]

Any suggestions?

2 Likes
2

Yeah, so the _id field is sorta special. It's not really an indexed field like other text fields, it's actually "generated" based on the UID of the document (see: https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-id-field.html).

So it only supports a limited subset of the query functionality. If you want to do more advanced text search like prefix/wildcard/fuzzy, etc, you'll need to index the ID into an actual text field on the document itself.

3

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