Couchbase Java SDK subdocument mutation - couchbase-java-api

Hi Im running couchabse server 7.1.3 docker container and trying to use the 3.3.4 couchbase java sdk version. I am facing an issue while performing subdocument mutation using the upsert command.
The issue I am facing is when I use the collection.mutateIn() method to perform a subdocument mutation using the upsert command, I am expecting to get the result of the operation as a MutateInResult object. when I try to use the MutateInResult.contentAs(0, String.class) to see the response I get the Index 0 is invalid error. I see that the operation as in is successful in the DB, I can see the desired json path has the updated value.
P.S: I only have a single mutation to perform which is the upsert command.
can someone please help if I am missing something here?

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