diff --git a/collectd/files/plugin/elasticsearch_cluster.py b/collectd/files/plugin/elasticsearch_cluster.py
index c3dcf37..f60c1bc 100644
--- a/collectd/files/plugin/elasticsearch_cluster.py
+++ b/collectd/files/plugin/elasticsearch_cluster.py
@@ -35,6 +35,7 @@
         self.plugin = NAME
         self.address = '127.0.0.1'
         self.port = 9200
+        self._node_id = None
         self.session = requests.Session()
         self.url = None
         self.session.mount(
@@ -51,25 +52,41 @@
             if node.key == 'Port':
                 self.port = node.values[0]
 
-        self.url = "http://{address}:{port}/_cluster/health".format(
+        self.url = "http://{address}:{port}/".format(
             **{
                 'address': self.address,
                 'port': int(self.port),
             })
 
-    def itermetrics(self):
+    def query_api(self, resource):
+        url = "{}{}".format(self.url, resource)
         try:
-            r = self.session.get(self.url)
+            r = self.session.get(url)
         except Exception as e:
-            msg = "Got exception for '{}': {}".format(self.url, e)
+            msg = "Got exception for '{}': {}".format(url, e)
             raise base.CheckException(msg)
 
         if r.status_code != 200:
-            msg = "{} responded with code {}".format(
-                self.url, r.status_code)
+            msg = "{} responded with code {}".format(url, r.status_code)
             raise base.CheckException(msg)
 
-        data = r.json()
+        return r.json()
+
+    @property
+    def node_id(self):
+        if self._node_id is None:
+            local_node = self.query_api('_nodes/_local')
+            self._node_id = local_node.get('nodes', {}).keys()[0]
+
+        return self._node_id
+
+    def itermetrics(self):
+        # Collect cluster metrics only from the elected master
+        master_node = self.query_api('_cluster/state/master_node')
+        if master_node.get('master_node', '') != self.node_id:
+            return
+
+        data = self.query_api('_cluster/health')
         self.logger.debug("Got response from Elasticsearch: '%s'" % data)
 
         yield {