title: Redisearch for JSON doesn't support key prefix option
body: <p>I wanted to use redisearch with JSON data. But I wanted segregate JSON data in different namespace so that index created can only search on specific namespace. Currently redisearch index are created on schema but doesn't have KEY prefix</p>
  <p>FT.CREATE IDX ON JSON SCHEMA $ ......</p>
  <p>for non-JSON prefix option is available but that doesn't contain JSON data.</p>
  <p>How to solve this problem ??</p>