Auto classification

I'm working on a model where i will have the input data in AVRO format
and index the data into ES.
Before indexing I would like to add catagories to the data i.e Auto-*

eg: the data contains books. Each book will have a field topics or text.
Now before indexing i would like to assign catagories to it. Say a
particular book is for hadoop, servlets etc.there may be n number of
catagories assigned.

Any suggestions as to how i can proceed.
Is there any plugin available for the same?

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