DnAttribute annotation ignores value if index is present

[marcusdacoregio]

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The DefaultObjectDirectoryMapper ignores the value attribute from @DnAttribute if index is present.

See the following sample: https://github.com/marcusdacoregio/ldap-odm-index-bug

This is strange behavior that could be fixed or at least documented properly.

Related to https://github.com/spring-projects/spring-ldap/issues/315