I tried to retrieve all keys of the index with the following command via 
console, studio, and java api.

select key from index:<index-name>

But all have the error

Error: 
com.orientechnologies.orient.core.exception.OCommandExecutionException: 
Error on execution of command: sql.select from index:test

Error: java.lang.UnsupportedOperationException: firstKey

Is it a bug or do I make some mistake?

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