Solr's Grouping feature is not working for one of our datasets. It yields the grouping field's value as *null* at times, randomly (we haven't established a pattern so far), and puts documents in a single bucket while the field's value is different for each doc. Filtering on the actual value of that field is working fine, though.
Our schema on this particular field is the same for the last three months, and data ingested just last week is impacted by this issue. In the first screenshot, you can see the group value as null while the field has a value. The next picture contains the same field applied as a filter, and yielding the right number of matches against it but the grouping is still failing. - Neeraj
