The "Tagger" Request Handler, AKA the "SolrTextTagger" is a "text tagger". Given a dictionary (a Solr index) with a name-like field, you can post text to this request handler and it will return every occurrence of one of those names with offsets and other document metadata desired. It’s used for named entity recognition (NER). The tagger doesn’t do any natural language processing (NLP) (outside of