Stop serialising licensed flag

Author: pugnascotia

distribution/tools/plugin-cli/src/test/java/org/elasticsearch/plugins/ListPluginsCommandTests.java

@@ -152,7 +152,6 @@ public void testPluginWithVerbose() throws Exception {
                         "Elasticsearch Version: " + Version.CURRENT.toString(),
                         "Java Version: 1.8",
                         "Native Controller: false",
-                        "Licensed: false",
                         "Extended Plugins: []",
                         " * Classname: org.fake"),
                 terminal.getOutput());
@@ -173,7 +172,6 @@ public void testPluginWithNativeController() throws Exception {
                 "Elasticsearch Version: " + Version.CURRENT.toString(),
                 "Java Version: 1.8",
                 "Native Controller: true",
-                "Licensed: false",
                 "Extended Plugins: []",
                 " * Classname: org.fake"),
             terminal.getOutput());
@@ -195,7 +193,6 @@ public void testPluginWithVerboseMultiplePlugins() throws Exception {
                         "Elasticsearch Version: " + Version.CURRENT.toString(),
                         "Java Version: 1.8",
                         "Native Controller: false",
-                        "Licensed: false",
                         "Extended Plugins: []",
                         " * Classname: org.fake",
                         "fake_plugin2",
@@ -206,7 +203,6 @@ public void testPluginWithVerboseMultiplePlugins() throws Exception {
                         "Elasticsearch Version: " + Version.CURRENT.toString(),
                         "Java Version: 1.8",
                         "Native Controller: false",
-                        "Licensed: false",
                         "Extended Plugins: []",
                         " * Classname: org.fake2"),
                 terminal.getOutput());

server/src/main/java/org/elasticsearch/plugins/PluginInfo.java

@@ -50,6 +50,8 @@ public class PluginInfo implements Writeable, ToXContentObject {
     public static final String ES_PLUGIN_PROPERTIES = "plugin-descriptor.properties";
     public static final String ES_PLUGIN_POLICY = "plugin-security.policy";
 
+    private static final Version LICENSED_PLUGINS_SUPPORT = Version.V_6_8_14;
+
     private final String name;
     private final String description;
     private final String version;
@@ -123,11 +125,8 @@ public PluginInfo(final StreamInput in) throws IOException {
              */
             in.readBoolean();
         }
-        if (isLicensedPluginsSupported(in.getVersion())) {
-            isLicensed = in.readBoolean();
-        } else {
-            isLicensed = false;
-        }
+        // We don't serialise `isLicensed` in 6.8
+        isLicensed = false;
     }
 
     @Override
@@ -153,31 +152,13 @@ public void writeTo(final StreamOutput out) throws IOException {
              */
             out.writeBoolean(false);
         }
-        if (isLicensedPluginsSupported(out.getVersion())) {
-            out.writeBoolean(isLicensed);
-        }
+        // We don't serialise `isLicensed` in 6.8
     }
 
     // We have to create our own Version objects for 7.x because they aren't defined in the Version class.
     private static final Version V_7_0_0 = Version.fromId(7_00_00_99);
     private static final Version V_7_11_0 = Version.fromId(7_11_00_99);
 
-    /**
-     * Checks whether licensed plugins are supported in the supplied version. Licensed plugins were
-     * introduced late in the 6.8 and 7.x lifecycle, so it is not possible to simply check whether
-     * the supplied version is higher than a specific version. Rather, the version could fall in
-     * one of two possible ranges.
-     * @param version the version to check
-     * @return whether licensed plugins are supported in the version
-     */
-    private static boolean isLicensedPluginsSupported(Version version) {
-        if (version.onOrAfter(Version.V_6_8_14) && version.before(V_7_0_0)) {
-            return true;
-        }
-
-        return version.onOrAfter(V_7_11_0);
-    }
-
     /**
      * Reads the plugin descriptor file.
      *
@@ -246,7 +227,7 @@ public static PluginInfo readFromProperties(final Path path) throws IOException
         }
 
         boolean isLicensed = false;
-        if (isLicensedPluginsSupported(esVersion)) {
+        if (esVersion.onOrAfter(LICENSED_PLUGINS_SUPPORT)) {
             isLicensed = parseBooleanValue(name, "licensed", propsMap.remove("licensed"));
         }
 
@@ -364,7 +345,6 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
             builder.field("classname", classname);
             builder.field("extended_plugins", extendedPlugins);
             builder.field("has_native_controller", hasNativeController);
-            builder.field("licensed", isLicensed);
         }
         builder.endObject();
 
@@ -404,7 +384,6 @@ public String toString(String prefix) {
             .append(prefix).append("Elasticsearch Version: ").append(elasticsearchVersion).append("\n")
             .append(prefix).append("Java Version: ").append(javaVersion).append("\n")
             .append(prefix).append("Native Controller: ").append(hasNativeController).append("\n")
-            .append(prefix).append("Licensed: ").append(isLicensed).append("\n")
             .append(prefix).append("Extended Plugins: ").append(extendedPlugins).append("\n")
             .append(prefix).append(" * Classname: ").append(classname);
         return information.toString();

x-pack/plugin/monitoring/src/test/java/org/elasticsearch/xpack/monitoring/collector/cluster/ClusterStatsMonitoringDocTests.java

@@ -502,8 +502,7 @@ public void testToXContent() throws IOException {
                           + "\"description\":\"_plugin_desc\","
                           + "\"classname\":\"_plugin_class\","
                           + "\"extended_plugins\":[],"
-                          + "\"has_native_controller\":false,"
-                          + "\"licensed\":false"
+                          + "\"has_native_controller\":false"
                         + "}"
                       + "],"
                       + "\"network_types\":{"