[BUG] Dedup pushdown (top hits) not work when parse Object fields

[LantaoJin]

 curl -X POST "localhost:9200/_plugins/_ppl" \
-H "Content-Type: application/json" \
-d '{
"query": "source = big5 | dedup message | sort - `@timestamp` | head 5"
}'
{
  "error": {
    "reason": "There was internal problem at backend",
    "details": "java.sql.SQLException: exception while executing query: class java.lang.String cannot be cast to class java.util.Map (java.lang.String and java.util.Map are in module java.base of loader 'bootstrap')",
    "type": "RuntimeException"
  },
  "status": 500
}%

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