Understanding the Index Option Configuration
The field configuration allows you to add some extra indexing options from the ones that are currently set in the database configuration. Adding any index options to the field configuration does not add those options to the element-based index options at the database level.
To add or remove a particular index option to a field, you check or uncheck the box corresponding to the index option. Adding any index options that are not enabled in the database configuration will cause new and updated documents to use the new indexing for the field, and will trigger a reindex operation if reindex enable is set to true in the database configuration.
Options that are enabled in the database configuration appear in bold in the field configuration. The field settings in the database configuration and the database field configuration are ORed together. For example, if you uncheck the box next to an option with bold-face type in the field configuration, it does not change the equivalent option in the database configuration. To disable a field setting for the database, both the database and field configurations for that option must be consistent.