diff --git a/README.md b/README.md
index aee63e9..42a365d 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,7 @@ Sum by index to calculate the total fields per index. Useful for checking if an
 ```
 sum(es_indices_mappings_field_count) by(index) > 900
 ```
+Note that these counts don't include system fields (ones prefixed with `_`, e.g. `_id`), so may be slightly lower than the field count used by Elasticsearch to check the field limit.
 
 # Installation
 The exporter requires Python 3 and Pip 3 to be installed.
diff --git a/prometheus_es_exporter/indices_mappings_parser.py b/prometheus_es_exporter/indices_mappings_parser.py
index 1896b7e..66e9cbd 100644
--- a/prometheus_es_exporter/indices_mappings_parser.py
+++ b/prometheus_es_exporter/indices_mappings_parser.py
@@ -13,6 +13,12 @@ def count_object_fields(object_mappings, counts=None):
     for field, mapping in object_mappings['properties'].items():
         # This field is an object, so count its fields.
         if 'properties' in mapping:
+            field_type = 'object'
+            if field_type in counts:
+                counts[field_type] += 1
+            else:
+                counts[field_type] = 1
+
             counts = count_object_fields(mapping, counts=counts)
 
         else:
diff --git a/setup.py b/setup.py
index 575a8a3..b15eddb 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setup(
     name='prometheus-es-exporter',
-    version='0.14.1a1',
+    version='0.14.1',
     description='Elasticsearch query Prometheus exporter',
     long_description=long_description,
     long_description_content_type='text/markdown',
diff --git a/tests/test_indices_mappings_parser.py b/tests/test_indices_mappings_parser.py
index 3ed18ca..0d68b55 100644
--- a/tests/test_indices_mappings_parser.py
+++ b/tests/test_indices_mappings_parser.py
@@ -11,7 +11,7 @@ class Test(unittest.TestCase):
     # server populated with the following data (http command = Httpie utility):
     # > http -v POST localhost:9200/foo/_doc/1 val:=1 group1=a group2=a
     # > http -v POST localhost:9200/foo/_doc/2 val:=2 group1=a group2=b
-    # > http -v POST localhost:9200/foo/_doc/3 val:=3 group1=b group2=b
+    # > http -v POST localhost:9200/foo/_doc/3 val:=3 group1=b group2=b sub:='{"sub_val": 4}'
     def test_endpoint(self):
         # Endpoint: /_mappings?pretty
         response = {
@@ -36,6 +36,13 @@ def test_endpoint(self):
                                 }
                             }
                         },
+                        "sub": {
+                            "properties": {
+                                "sub_val": {
+                                    "type": "long"
+                                }
+                            }
+                        },
                         "val": {
                             "type": "long"
                         }
@@ -46,8 +53,9 @@ def test_endpoint(self):
 
         expected = {
             'field_count{index="foo",field_type="keyword"}': 2,
-            'field_count{index="foo",field_type="long"}': 1,
-            'field_count{index="foo",field_type="text"}': 2
+            'field_count{index="foo",field_type="long"}': 2,
+            'field_count{index="foo",field_type="text"}': 2,
+            'field_count{index="foo",field_type="object"}': 1
         }
         result = convert_result(parse_response(response))
         self.assertEqual(expected, result)
@@ -75,7 +83,7 @@ def test_endpoint_no_properties(self):
     # server populated with the following data (http command = Httpie utility):
     # > http -v POST localhost:9200/foo/bar/1 val:=1 group1=a group2=a
     # > http -v POST localhost:9200/foo/bar/2 val:=2 group1=a group2=b
-    # > http -v POST localhost:9200/foo/bar/3 val:=3 group1=b group2=b
+    # > http -v POST localhost:9200/foo/bar/3 val:=3 group1=b group2=b sub:='{"sub_val": 4}'
     def test_old_endpoint(self):
         # Endpoint: /_mappings?pretty
         response = {
@@ -101,6 +109,13 @@ def test_old_endpoint(self):
                                     }
                                 }
                             },
+                            "sub": {
+                                "properties": {
+                                    "sub_val": {
+                                        "type": "long"
+                                    }
+                                }
+                            },
                             "val": {
                                 "type": "long"
                             }
@@ -112,8 +127,9 @@ def test_old_endpoint(self):
 
         expected = {
             'field_count{index="foo",field_type="keyword"}': 2,
-            'field_count{index="foo",field_type="long"}': 1,
-            'field_count{index="foo",field_type="text"}': 2
+            'field_count{index="foo",field_type="long"}': 2,
+            'field_count{index="foo",field_type="text"}': 2,
+            'field_count{index="foo",field_type="object"}': 1
         }
         result = convert_result(parse_response(response))
         self.assertEqual(expected, result)