detect exact match for ES property queries (#793)

* detect exact match for ES property queries

* detect exact match for ES property queries

* update tests

pygeoapi/provider/elasticsearch_.py

@@ -236,13 +236,19 @@ class ElasticsearchProvider(BaseProvider):
         if properties:
             LOGGER.debug('processing properties')
             for prop in properties:
+                prop_name = self.mask_prop(prop[0])
                 pf = {
                     'match': {
-                        self.mask_prop(prop[0]): prop[1]
+                        prop_name: {
+                            'query': prop[1]
+                        }
                     }
                 }
                 query['query']['bool']['filter'].append(pf)
 
+            if '|' not in prop[1]:
+                pf['match'][prop_name]['minimum_should_match'] = '100%'
+
         if sortby:
             LOGGER.debug('processing sortby')
             query['sort'] = []

tests/test_elasticsearch__provider.py

@@ -161,9 +161,9 @@ def test_query(config):
     assert results['features'][0]['properties']['nameascii'] == 'Vatican City'
 
     results = p.query(properties=[('nameascii', 'Vatican City')])
-    assert len(results['features']) == 4
-    assert results['numberMatched'] == 4
-    assert results['numberReturned'] == 4
+    assert len(results['features']) == 1
+    assert results['numberMatched'] == 1
+    assert results['numberReturned'] == 1
 
     results = p.query(limit=1)
     assert len(results['features']) == 1