spring - Mongo @DBRef unique -

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my application uses spring boot / jpa / mongodb.

i map domain classes mongodb using

org.springframework.data.mongodb.core.mapping.document; org.springframework.data.mongodb.core.index.indexed; org.springframework.data.mongodb.core.mapping.dbref;

all except when trying make dbref unique : 

@dbref @indexed(unique = true) private user owner;

i have tried different combinations of @dbref, @indexed (unique=true) , cannot make dbref unique. can make other field-types unique, such 'name' in following example

@indexed(unique = true) @size(min = 2, max = 100) @column(length = 100) private string name;

but cannot find how make dbref field unique.

i'm coming morphia side of mapping, i'd try this:

@compoundindexes({     @compoundindex(name = "owner", def = "{'owner.id' : 1}", unique = true) })

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