I am not sure if it's supposed to be that @MappedSuperclass document can define @ChangeTrackingPolicy for multiple documents but in fact it does not work.

In other words in the case below:
===================================================

/**

• @MappedSuperclass
• @InheritanceType("COLLECTION_PER_CLASS")
• @ChangeTrackingPolicy("DEFERRED_EXPLICIT")
  */
  abstract class MappedDocument
  {
  }

/**

• @Document(collection="chart")
  */
  class Chart extends MappedDocument
  {
  }

===================================================

class Chart

• has InheritanceType = INHERITANCE_TYPE_COLLECTION_PER_CLASS which is expected
• but ChangeTrackingPolicy = CHANGETRACKING_DEFERRED_IMPLICIT (value by default) which is NOT expected.

At the same time if to define ChangeTrackingPolicy in the Chart class instead of MappedDocument it works as expected.