If you try to use the strdist function on a field which is missing in some docs, you'll get a NullPointerException
A workarround in some contexts can be to wrap the strdist function in an "if" that checks exists(fieldname) and returns some suitable default if it's not found.
THIS: if(exists(field_name_s),strdist("literal",field_name_s,edit),0) INSTEAD OF: strdist("literal",field_name_s,edit)
- relates to
SOLR-6354 Support stats over functions