Optional Tag Clause search in Litium 7 Data Service

How do we implement the optional tag clause in lucene search in Data Service search in Litium 7?

Litium version: 7

OptionalTagClause is Litium abstraction of Lucene.NET search index and can not be used when you use DataService that is an abstractions on of the database.

You can find some information about DataService here with example how you use the mandatory (AND) and exclude (AND NOT) filter search where you also have an Should version that will be mapped to an OR filter statement.

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