How to match an empty field in kibana

Elastic Stack Kibana
1

In one log request we have multiple attributes, in that one of the attribute value is empty. How I can get the result for the particular attribute which has empty value using DQL query.
I tried the query like "\n "productPrice" : "",\n" and "productPrice" : """
but getting results for all the values.

Log is like this - "productPrice" : ""

Note: we don't have any field for this attribute

2

I assume DQL is Opensearch Dashboards Query Language. There is no DQL query in Elasticsearch or Kibana. There is KQL which stands for Kibana Query Language.

Anyway, if the field is not exist or has no value you can search like the following.

 NOT productPrice : *

If you only want to filter or filter-out the empty/null value, you can check null-value documentation.