Use https for artifact locations

This commit switches to using https for some artifact locations.

buildSrc/src/testKit/testclusters/build.gradle

@@ -14,7 +14,7 @@ allprojects { all ->
         String luceneSnapshotRevision = System.getProperty("test.lucene-snapshot-revision")
         if (luceneSnapshotRevision != null) {
             maven {
-                url "http://s3.amazonaws.com/download.elasticsearch.org/lucenesnapshots/" + luceneSnapshotRevision
+                url "https://s3.amazonaws.com/download.elasticsearch.org/lucenesnapshots/" + luceneSnapshotRevision
             }
         }
 

qa/wildfly/build.gradle

@@ -37,7 +37,7 @@ int managementPort
 repositories {
     // the Wildfly distribution is not available via a repository, so we fake an Ivy repository on top of the download site
     ivy {
-        url "http://download.jboss.org"
+        url "https://download.jboss.org"
         patternLayout {
             artifact 'wildfly/[revision]/[module]-[revision].[ext]'
         }

x-pack/plugin/ml/cpp-snapshot/build.gradle

@@ -8,7 +8,7 @@ ext.version = VersionProperties.elasticsearch
 // for this project so it can be used with dependency substitution.
 
 void getZip(File snapshotZip) {
-  String zipUrl = "http://prelert-artifacts.s3.amazonaws.com/maven/org/elasticsearch/ml/ml-cpp/${version}/ml-cpp-${version}.zip"
+  String zipUrl = "https://prelert-artifacts.s3.amazonaws.com/maven/org/elasticsearch/ml/ml-cpp/${version}/ml-cpp-${version}.zip"
   File snapshotMd5 = new File(snapshotZip.toString() + '.md5')
   HttpURLConnection conn = (HttpURLConnection) new URL(zipUrl).openConnection();