[2021/05/21 22:15:01.541] FAIL [0.031s]: test_index_filter (test_collection.TestCollection)
 [2021/05/21 22:15:01.541] ----------------------------------------------------------------------
 [2021/05/21 22:15:01.541] Traceback (most recent call last):
 [2021/05/21 22:15:01.541]   File "/data/mci/11ff8e9d6ed377cda2fa923dd1df1083/src/test/__init__.py", line 509, in wrap
 [2021/05/21 22:15:01.541]     return f(*args, **kwargs)
 [2021/05/21 22:15:01.541]   File "/data/mci/11ff8e9d6ed377cda2fa923dd1df1083/src/test/test_collection.py", line 611, in test_index_filter
 [2021/05/21 22:15:01.541]     self.assertEqual("x_1", stage.get('indexName'))
 [2021/05/21 22:15:01.541] AssertionError: 'x_1' != None

 [2021/05/21 22:08:12.621] db version v5.0.0-alpha0-566-g9fd5b3a
 [2021/05/21 22:08:12.621] Build Info: {
 [2021/05/21 22:08:12.621]     "version": "5.0.0-alpha0-566-g9fd5b3a",
 [2021/05/21 22:08:12.621]     "gitVersion": "9fd5b3adca829fe003e58c5d9ba5e56f1ae18059",
 [2021/05/21 22:08:12.621]     "openSSLVersion": "OpenSSL 1.0.2k-fips  26 Jan 2017",
 [2021/05/21 22:08:12.621]     "modules": [
 [2021/05/21 22:08:12.621]         "enterprise"
 [2021/05/21 22:08:12.621]     ],
 [2021/05/21 22:08:12.621]     "allocator": "tcmalloc",
 [2021/05/21 22:08:12.621]     "environment": {
 [2021/05/21 22:08:12.621]         "distmod": "amzn64",
 [2021/05/21 22:08:12.621]         "distarch": "x86_64",
 [2021/05/21 22:08:12.621]         "target_arch": "x86_64"
 [2021/05/21 22:08:12.621]     }
 [2021/05/21 22:08:12.621] }

        self.assertEqual("x_1", db.test.create_index(
            [('x', ASCENDING)], partialFilterExpression={"a": {"$lte": 1.5}}))
        db.test.insert_one({"x": 5, "a": 2})
        db.test.insert_one({"x": 6, "a": 1})

        # Operations that use the partial index.
        explain = db.test.find({"x": 6, "a": 1}).explain()
        stage = self.get_plan_stage(explain['queryPlanner']['winningPlan'],
                                    'IXSCAN')
        self.assertEqual("x_1", stage.get('indexName'))