The Solr index built to support POS Extracted Features searching is strongly based around the dynamic fields that are part of the default managed schema provided in the Apache project. The key variation made to this schema is that the _txt dynamic field is not stored.
The _t dynamic field remains unchanged and is stored. This provides a useful way to retrieve metadata about matching items when producing the result set page in response to a query. Both _txt and _t are used to perform queries at the volume-level.
The dynamic field _htrctokentext field is very similar to _txt but used for page-level indexed fields.
For faceting, it is important that multiple word terms (such as non fiction) remain as a single entity, and are not tokenized into separate words. This leads to the use of dynamic fields such as _s, _ss at the volume-level when metadata can, respectively, only have one value (e.g., Copyright) and multiple values (e.g., Genre). At the page-level the dynamic fields used are _htrcstring and htrcstrings.
For more details, see README-Solr-Schema.txt.
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