PlanEnumerator AndAssignment::choices ordering not stable and is relevant to set of plans generated

diff --git a/jstests/core/repro.js b/jstests/core/repro.js

new file mode 100644

index 0000000000..511d1819ef

--- /dev/null

+++ b/jstests/core/repro.js

@@ -0,0 +1,27 @@

+

+db.coll.drop();

+db.coll.insert({});

+db.coll.createIndexes([

+    {"obj.obj.obj.obj.str": 1, "obj.obj.obj.str": 1},

+    {"obj.obj.obj.str": -1, "date": -1},

+    {"obj.date": 1},

+    {"obj.obj.obj.str": 1, "obj.obj.obj.obj.date": -1},

+    {"obj.date": -1, "obj.obj.obj.str": 1},

+    {"obj.date": 1, "obj.obj.num": 1},

+    {"obj.obj.obj.str": 1, "obj.obj.obj.date": -1},

+    {"obj.obj.obj.obj.str": 1, "obj.date": 1}

+]);

+var result =

+    db.coll

+        .aggregate([

+            {

+              $match: {

+                  $and: [

+                      {$or: [{'obj.obj.obj.str': {$not: {$in: []}}}, {'obj.date': {$nin: []}}]},

+                      {'obj.obj.obj.obj.str': {$not: {$lte: ''}}}

+                  ]

+              }

+            },

+            {$project: {"obj.obj.obj.obj.str": 1, "_id": 0}}

+        ])

+        .toArray();

diff --git a/src/mongo/db/query/query_planner.cpp b/src/mongo/db/query/query_planner.cpp

index 9735dbade0..4145df3056 100644

--- a/src/mongo/db/query/query_planner.cpp

+++ b/src/mongo/db/query/query_planner.cpp

@@ -828,7 +828,7 @@ StatusWith<std::vector<std::unique_ptr<QuerySolution>>> QueryPlanner::plan(

     // Don't leave tags on query tree.

     query.root()->resetTag();

-    LOG(5) << "Planner: outputted " << out.size() << " indexed solutions.";

+    LOG(0) << "Planner: outputted " << out.size() << " indexed solutions.";

     // Produce legible error message for failed OR planning with a TEXT child.

     // TODO: support collection scan for non-TEXT children of OR.