Pass cacert file with the correct type to the elasticsearch loader

CHANGELOG.asciidoc

@@ -28,6 +28,8 @@ https://github.com/elastic/beats/compare/v5.6.8...5.6[Check the HEAD diff]
 
 *Affecting all Beats*
 
+- Fix a type issue when specifying certicate authority when using the `import_dashboards` command. {pull}6678[6678]
+
 *Filebeat*
 
 *Heartbeat*

libbeat/dashboards/import_dashboards.go

@@ -167,7 +167,7 @@ func ImportDashboards() error {
 	}
 
 	if len(cl.opt.CertificateAuthority) > 0 {
-		tlsConfig["certificate_authorities"] = fmt.Sprintf("[%s]", cl.opt.CertificateAuthority)
+		tlsConfig["certificate_authorities"] = []string{cl.opt.CertificateAuthority}
 	}
 
 	if len(tlsConfig) > 0 {

libbeat/outputs/elasticsearch/output.go

@@ -10,6 +10,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/joeshaw/multierror"
+
 	"github.com/elastic/beats/libbeat/common"
 	"github.com/elastic/beats/libbeat/common/op"
 	"github.com/elastic/beats/libbeat/logp"
@@ -82,15 +84,18 @@ func NewConnectedClient(cfg *common.Config) (*Client, error) {
 		return nil, err
 	}
 
+	var errs multierror.Errors
+
 	for _, client := range clients {
 		err = client.Connect(client.timeout)
 		if err != nil {
 			logp.Err("Error connecting to Elasticsearch: %s", client.Connection.URL)
+			errs = append(errs, err)
 			continue
 		}
 		return &client, nil
 	}
-	return nil, fmt.Errorf("Couldn't connect to any of the configured Elasticsearch hosts")
+	return nil, fmt.Errorf("Couldn't connect to any of the configured Elasticsearch hosts, errors: %v", errs.Err())
 }
 
 // NewElasticsearchClients returns a list of Elasticsearch clients based on the given

metricbeat/module/prometheus/_meta/Dockerfile

@@ -1,3 +1,3 @@
-FROM  prom/prometheus
-
+FROM prom/prometheus:v1.5.1
+HEALTHCHECK --interval=1s --retries=90 CMD nc -w 1 localhost 9090 </dev/null
 EXPOSE 9090

testing/environments/args.yml

@@ -6,4 +6,4 @@ services:
     build:
       args:
         DOWNLOAD_URL: https://snapshots.elastic.co/downloads
-        ELASTIC_VERSION: 5.6.8-SNAPSHOT
+        ELASTIC_VERSION: 5.6.9-SNAPSHOT

testing/environments/latest.yml

@@ -17,7 +17,7 @@ services:
       context: docker/logstash
       dockerfile: Dockerfile
       args:
-        ELASTIC_VERSION: 5.4.1
+        ELASTIC_VERSION: 5.6.8
         DOWNLOAD_URL: https://artifacts.elastic.co/downloads
     environment:
       - ES_HOST=elasticsearch