6b3c3152___Object_Search_Engine_Mapping__Description
[Attribute] managed-id-index (optional, defaults to compass.managedId.index setting, which defaults to no) [Description] 
Can be either not_analyzed or no. It is the index setting that will be used when creating an internal managed id for a class property mapping (if it is not a property id, if it is, it will always be not_analyzed).
Chapter 6. OSEM - Object/Search Engine Mapping
Description