When using inheritance, indexes defined for all but the root entities are ignored.

Example:

The sql generated from the schema file below does not have the index defined for EntityB.

Schema.yml

EntityA:
  columns:
    property_a: string(10)
  indexes:
    index_one:
      fields: [property_a]
      type: unique

EntityB:
  inheritance:
    extends: EntityA
    type: column_aggregation
  columns:
    property_b: string(10)
  indexes:
    index_two:
      fields: [property_b]
      type: unique