SERVER-24720/SERVER-24782 Move serverStatus.balancer to a balancerStatus command

This change gets rid of the serverStatus.balancer section and moves its
functionality to a new balancer command called 'balancerStatus'.

In addition it gets rid of the 'controlBalancer' command and splits it
into two commands - balancerStart and balancerStop.

1 files changed, 3 insertions, 4 deletions

diff --git a/jstests/sharding/top_chunk_autosplit.js b/jstests/sharding/top_chunk_autosplit.js
index 5d23386230c..6047e7a948c 100644
--- a/jstests/sharding/top_chunk_autosplit.js
+++ b/jstests/sharding/top_chunk_autosplit.js
@@ -2,10 +2,9 @@ function shardSetup(shardConfig, dbName, collName) {
     var st = new ShardingTest(shardConfig);
     var db = st.getDB(dbName);
 
-    // Disable the balancer to not interfere with the test, but keep the balancer settings on
-    // (with default empty document) so the auto split logic will be able to move chunks around.
-    assert.writeOK(st.s.getDB('config').settings.remove({_id: 'balancer'}));
-    db.adminCommand({configureFailPoint: 'skipBalanceRound', mode: 'alwaysOn'});
+    // Set the balancer mode to only balance on autoSplit
+    assert.writeOK(st.s.getDB('config').settings.update(
+        {_id: 'balancer'}, {'$unset': {stopped: ''}, '$set': {mode: 'autoSplitOnly'}}));
     return st;
 }