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I have an existing index on a field using Morhia.
@Indexed
public String field;
now I want to convert that to a unique index.
@Indexed(unique = true)
public String field;
On application start, I call db.ensureIndexes() – however the uniqueness of the index is not reflected in mongo.
Why is this failing? Whats the best way to achieve this?
The properties of an index in MongoDB can’t be modified after creation; thus you cannot directly convert a non-unique index into a unique index. You will have to drop the index manually before it can be recreated as a unique index. You can do this directly with the mongo shell: see http://www.mongodb.org/display/DOCS/Indexes#Indexes-DroppingIndexes.