How define a unique constrain using JPA nosql (eclipselink) and MongoDB

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I trying to define a Nosql entity using org.eclipse.persistence.nosql libraries but I'm not able to define a unique constraint.

So, until now I've been looking for something like the following SQL syntax but for the NOSql annotation. @Entity @Table(name="TDWC_DATASOURCE", uniqueConstraints=@UniqueConstraint(columnNames={"name", "userId"}))

Is there any param/option to have a constraint also in nosql db? Is there any alternative? Thanks in advance Andrea

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