: Using solr 8.3.0 it seems like required operator isn't functioning properly
: when default conjunction operator is AND.
You're mixing the "prefix operators" with the "infix operators" which is
always a recipe for disaster.
The use of q.op=AND vs q.op=OR in these examples only
complicates the issue because q.op isn't really overriding any sort of implicit
"infix operator" when clauses exist w/o an infix operator between them, it
is overriding the implicit MUST/SHOULD/MUST_NOT given to each clause as
parsed ... but in general setting q.op-AND really only makes sense when
you expect/intend to only be using "infix operators"
This write up i did several years ago is still very accurate -- the bottom
line is you REALLY don't want to mix infix and prefix operators..
https://lucidworks.com/post/why-not-and-or-and-not/
...because the results of mixing them really only "make sense" given the
context that the parser goes left to right (ie: no precedence) and has
no explicit "prefix" operator syntax for "SHOULD"
-Hoss
http://www.lucidworks.com/
