A conundrum: the DelimitedPayloadTokenFilter adds a payload to term,
and the payload is stored. Luke shows that the payload exists. I wrote
a TokenFilter that adds a payload, but the payload is not stored. Both
Solr field types are declared the very same way.
The Schema Analysis browser shows that both filters add a payload
attribute. What factors are required for a field to store payloads?
(This is with the default codec.)