Revert "Fixed: In Solr fixe NPE in FieldLengthFeature with non-stored/missing fields."
(OFBIZ-12898)

At least testAddListToSolrIndex does not pass. It's a weird error. But as we
no longer intent to release this branch, it's easier to revert this commit than
to investigate the reason...

[JUNIT (error)] - testAddListToSolrIndex : org.apache.ofbiz.service.GenericServiceException:
Service [addListToSolrIndex] target threw an unexpected exception
(Error from server at https://localhost:8443/solr/solrdefault:
SolrCore 'solrdefault' is not available due to init failure:
Could not load conf for core solrdefault: Error loading solr config from
plugins/solr/home/solrdefault/conf/solrconfig.xml
4 files changed