[SOLR-12350] Do not use docValues as stored for _str (copy)fields in _default configset

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.5, 8.0
• Component/s: Data-driven Schema
• Assignee: Jan Høydahl
• Reporter: Jan Høydahl
• Created: 14/May/18 12:26
• Updated: 08/Jun/19 15:14
• Resolved: 08/Jun/18 13:17

Description

When improving data-driven mode in SOLR-9526 we discussed back and forth whether to set useDocValuesAsStored for the *_str copy of text fields. This dynamic field is currently defined as

<dynamicField name="*_str" type="strings" stored="false" docValues="true" indexed="false" />

Having lived with the current setting since 7.0, I think it is too noisy to return all the _str fields since this is redundant content from the analysed original field. Thus I propose to do as hossman initially suggested, and explicitly set it to false starting from 7.4:

<dynamicField name="*_str" type="strings" stored="false" indexed="false" docValues="true" useDocValuesAsStored="false" />

Note that this does not change how things are stored, only whether to display these by default. The *_str fields will still be available for sorting, faceting etc.