compute metadata in the same child process that builds indexes

lib/commands/metadata.js

@@ -18,15 +18,7 @@ Data.getMetadataRaw = function (Env, channel /* channelName */, _cb) {
     }
 
     Env.batchMetadata(channel, cb, function (done) {
-        var ref = {};
-        var lineHandler = Meta.createLineHandler(ref, Env.Log.error);
-        return void Env.msgStore.readChannelMetadata(channel, lineHandler, function (err) {
-            if (err) {
-                // stream errors?
-                return void done(err);
-            }
-            done(void 0, ref.meta);
-        });
+        Env.computeMetadata(channel, done);
     });
 };