After indexing - reindexing I get this

The following conditional facet(s) are defined but not indexed: format_fc, subject_spatial_fc, subject_topic_fc, type_of_content_fc, subject_temporal_fc. It may worth revisiting the PHP codes which create the content of those fields, it is possible, that the missing inside index can be originated to a coding problem.
The following fields were not indexed possibly due to missing data: dc__contributor_t, dc__coverage_t, dc__creator_t, dc__date_t, dc__date_dt, dc__description_t, dc__format_t, dc__identifier_t, dc__language_t, dc__publisher_t, dc__relation_t, dc__rights_t, dc__source_t, dc__subject_t, dc__title_t, dc__type_t, dcterms__date_dt, dcterms__dateAccepted_dt, dcterms__dateCopyrighted_dt, dcterms__dateSubmitted_dt, dcterms__subject_DDC_s.

Why is this happening please help.
thank you