add test + update changelog

CHANGELOG.asciidoc

@@ -68,6 +68,7 @@ https://github.com/elastic/beats/compare/v6.2.3...master[Check the HEAD diff]
 - Error out on invalid Autodiscover template conditions settings. {pull}7200[7200]
 - Do not emit Kubernetes autodiscover events for Pods without IP address. {pull}7235[7235]
 - Allow to override the `ignore_above` option when defining new field with the type keyword. {pull}7238[7238]
+- Allow index-pattern only setup when setup.dashboards.only_index=true. {pull}7285[7285]
 
 *Auditbeat*
 

libbeat/tests/system/test_dashboard.py

@@ -36,6 +36,32 @@ def test_load_dashboard(self):
 
         assert self.log_contains("Kibana dashboards successfully loaded") is True
 
+    @unittest.skipUnless(INTEGRATION_TESTS, "integration test")
+    @attr('integration')
+    def test_load_only_index_patterns(self):
+        """
+        Test loading dashboards
+        """
+        self.render_config_template()
+        beat = self.start_beat(
+            logging_args=["-e", "-d", "*"],
+            extra_args=["setup",
+                        "--dashboards",
+                        "-E", "setup.dashboards.file=" +
+                        os.path.join(self.beat_path, "tests", "files", "testbeat-dashboards.zip"),
+                        "-E", "setup.dashboards.beat=testbeat",
+                        "-E", "setup.dashboards.only_index=true",
+                        "-E", "setup.kibana.protocol=http",
+                        "-E", "setup.kibana.host=" + self.get_kibana_host(),
+                        "-E", "setup.kibana.port=" + self.get_kibana_port(),
+                        "-E", "output.elasticsearch.hosts=['" + self.get_host() + "']",
+                        "-E", "output.file.enabled=false"]
+        )
+
+        beat.check_wait(exit_code=0)
+
+        assert self.log_contains("Kibana dashboards successfully loaded") is True
+
     @unittest.skipUnless(INTEGRATION_TESTS, "integration test")
     @attr('integration')
     def test_export_dashboard(self):