fix(#9508): switch to ioredis (#9545)

* switch to ioredis

also need this fix in redisearch:

redis-search.js:98
```
  redisClient.multi(cmds).exec(function(err, ids) {
    if (err) {
      return callback(err);
    }
    var errRes = ids[resultIndex];
    if (errRes[0]) {
      return callback(errRes[0]);
    }
    callback(null, errRes[1]);
  });
```

* dbsearch compatible with ioredis

* fixed dbsearch?

src/database/redis/hash.js

@@ -111,6 +111,14 @@ module.exports = function (module) {
 			data = [await module.client.async.hgetall(unCachedKeys[0])];
 		}
 
+		// convert empty objects into null for back-compat with node_redis
+		data = data.map((elem) => {
+			if (!Object.keys(elem).length) {
+				return null;
+			}
+			return elem;
+		});
+
 		unCachedKeys.forEach((key, i) => {
 			cachedData[key] = data[i] || null;
 			cache.set(key, cachedData[key]);