Access Index reader to generate word cloud through plugin

We are indexing text files directly into ES for content searching. We have around 500 indexes and total 3tb data sitting on ES. Now the requirement is to generate word cloud for a specific index with terms and term frequency. We checked the term vector API but its related to a specific document which is not a feasible solution to iterate all documents and fetch the vectors. We also thought about using Aggregation but that would also be not possible for us because it will eat up the memory and also there is not paging support so at last the only solution is to create the ES plugin whereby providing the index name will generate the word cloud and provide the output based on pagination. Please let us know how to access Index reader in a plugin

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