[TIKA-3564] Remove duplicate "subject" tags

• Type: Task
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.2.0
• Assignee: Unassigned
• Reporter: Tim Allison
• Created: 04/Oct/21 18:31
• Updated: 16/Dec/21 22:29
• Resolved: 04/Oct/21 19:50

Description

In 2.x, we tried to remove duplicate/triplicate metadata keys. It looks like we left subject duplicated:

   Property SUBJECT = Property.composite(Property.externalText(
            PREFIX + TikaCoreProperties.NAMESPACE_PREFIX_DELIMITER + "subject"),
            new Property[]{DublinCore.SUBJECT,});

We should migrate this to a simple DublinCore.SUBJECT property.