# Error message in MassIndexerImpl#toRootEntities mentions "a subclass of an indexed entity" but should mention "supertype" instead

## Description

When an class passed to the MassIndexer is invalid, we throw an exception with this message:

But we actually do not care whether the entity is a subclass of an indexed entity; we want it to either be indexed or be a *superclass* of an indexed entity.

We should change the message accordingly.

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Yoann Rodière

Yoann Rodière

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Minor
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