Merge branch 'master' into ccr-docs

* master: (74 commits)
  XContent: Check for bad parsers (elastic#34561)
  Docs: Align prose with snippet (elastic#34839)
  document the search context is freed if the scroll is not extended (elastic#34739)
  Test: Lookup node versions on rest test start (elastic#34657)
  SQL: Return error with ORDER BY on non-grouped. (elastic#34855)
  Reduce channels in AbstractSimpleTransportTestCase (elastic#34863)
  [DOCS] Updates Elasticsearch monitoring tasks (elastic#34339)
  Check self references in metric agg after last doc collection (elastic#33593) (elastic#34001)
  [Docs] Add `indices.query.bool.max_clause_count` setting (elastic#34779)
  Add 6.6.0 version to master (elastic#34847)
  Test: ensure char[] doesn't being with prefix (elastic#34816)
  Remove static import from HLRC doc snippet (elastic#34834)
  Logging: server: clean up logging (elastic#34593)
  Logging: tests: clean up logging (elastic#34606)
  SQL: Fix edge case: `<field> IN (null)` (elastic#34802)
  [Test] Mute FullClusterRestartIT.testShrink() until test is fixed
  SQL: Introduce ODBC mode, similar to JDBC (elastic#34825)
  SQL: handle X-Pack or X-Pack SQL not being available in a more graceful way (elastic#34736)
  [Docs] Add explanation for code snippets line width (elastic#34796)
  CCR: Rename follow-task parameters and stats (elastic#34836)
  ...

Author: jasontedor

CONTRIBUTING.md

@@ -159,6 +159,7 @@ Please follow these formatting guidelines:
 
 * Java indent is 4 spaces
 * Line width is 140 characters
+* Line width for code snippets that are included in the documentation (the ones surrounded by `// tag` and `// end` comments) is 76 characters
 * The rest is left to Java coding standards
 * Disable “auto-format on save” to prevent unnecessary format changes. This makes reviews much harder as it generates unnecessary formatting changes. If your IDE supports formatting only modified chunks that is fine to do.
 * Wildcard imports (`import foo.bar.baz.*`) are forbidden and will cause the build to fail. This can be done automatically by your IDE:

buildSrc/build.gradle

@@ -31,22 +31,12 @@ if (GradleVersion.current() < GradleVersion.version(minimumGradleVersion)) {
     throw new GradleException("Gradle ${minimumGradleVersion}+ is required to build elasticsearch")
 }
 
-if (JavaVersion.current() < JavaVersion.VERSION_1_8) {
-  throw new GradleException('Java 1.8 is required to build elasticsearch gradle tools')
-}
-
 if (project == rootProject) {
   // change the build dir used during build init, so that doing a clean
   // won't wipe out the buildscript jar
   buildDir = 'build-bootstrap'
 }
 
-// Make sure :buildSrc: doesn't generate classes incompatible with RUNTIME_JAVA_HOME
-// We can't use BuildPlugin here, so read from file
-String minimumRuntimeVersion = file('src/main/resources/minimumRuntimeVersion').text.trim()
-targetCompatibility = minimumRuntimeVersion
-sourceCompatibility = minimumRuntimeVersion
-
 /*****************************************************************************
  *         Propagating version.properties to the rest of the build           *
  *****************************************************************************/
@@ -82,6 +72,45 @@ processResources {
   from tempPropertiesFile
 }
 
+
+if (JavaVersion.current() < JavaVersion.VERSION_1_10) {
+  throw new GradleException('At least Java 10 is required to build elasticsearch gradle tools')
+}
+
+/*****************************************************************************
+ *         Java version                                                      *
+ *****************************************************************************/
+
+// Gradle 4.10 does not support setting this to 11 yet
+targetCompatibility = "10"
+sourceCompatibility = "10"
+
+// We have a few classes that need to be compiled for older java versions because these are used to run checks against
+// those
+sourceSets {
+  minimumRuntime {
+    // We only want Java here, but the Groovy doesn't configure javadoc correctly if we don't define this as groovy
+    groovy {
+      srcDirs = ['src/main/minimumRuntime']
+    }
+  }
+}
+compileMinimumRuntimeGroovy {
+  // We can't use BuildPlugin here, so read from file
+  String minimumRuntimeVersion = file('src/main/resources/minimumRuntimeVersion').text.trim()
+  targetCompatibility = minimumRuntimeVersion
+  sourceCompatibility = minimumRuntimeVersion
+}
+dependencies {
+  compile sourceSets.minimumRuntime.output
+  minimumRuntimeCompile "junit:junit:${props.getProperty('junit')}"
+  minimumRuntimeCompile localGroovy()
+}
+jar {
+  from sourceSets.minimumRuntime.output
+}
+
+
 /*****************************************************************************
  *                    Dependencies used by the entire build                  *
  *****************************************************************************/
@@ -94,10 +123,7 @@ dependencies {
   compile localGroovy()
   compile "com.carrotsearch.randomizedtesting:junit4-ant:${props.getProperty('randomizedrunner')}"
   compile "com.carrotsearch.randomizedtesting:randomizedtesting-runner:${props.getProperty('randomizedrunner')}"
-
-  compile("junit:junit:${props.getProperty('junit')}") {
-    transitive = false
-  }
+  
   compile 'com.netflix.nebula:gradle-extra-configurations-plugin:3.0.3'
   compile 'com.netflix.nebula:nebula-publishing-plugin:4.4.4'
   compile 'com.netflix.nebula:gradle-info-plugin:3.0.3'
@@ -156,6 +182,7 @@ if (project != rootProject) {
   dependenciesInfo.enabled = false
   forbiddenApisMain.enabled = false
   forbiddenApisTest.enabled = false
+  forbiddenApisMinimumRuntime.enabled = false
   jarHell.enabled = false
   thirdPartyAudit.enabled = false
 

buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy

@@ -99,12 +99,14 @@ class BuildPlugin implements Plugin<Project> {
         configureSourcesJar(project)
         configurePomGeneration(project)
 
+        applyCommonTestConfig(project)
         configureTest(project)
         configurePrecommit(project)
         configureDependenciesInfo(project)
     }
 
 
+
     /** Performs checks on the build environment and prints information about the build environment. */
     static void globalBuildInfo(Project project) {
         if (project.rootProject.ext.has('buildChecksDone') == false) {
@@ -776,9 +778,8 @@ class BuildPlugin implements Plugin<Project> {
         }
     }
 
-    /** Returns a closure of common configuration shared by unit and integration tests. */
-    static Closure commonTestConfig(Project project) {
-        return {
+    static void applyCommonTestConfig(Project project) {
+        project.tasks.withType(RandomizedTestingTask) {
             jvm "${project.runtimeJavaHome}/bin/java"
             parallelism System.getProperty('tests.jvms', 'auto')
             ifNoTests System.getProperty('tests.ifNoTests', 'fail')
@@ -873,6 +874,8 @@ class BuildPlugin implements Plugin<Project> {
 
             exclude '**/*$*.class'
 
+            dependsOn(project.tasks.testClasses)
+
             project.plugins.withType(ShadowPlugin).whenPluginAdded {
                 // Test against a shadow jar if we made one
                 classpath -= project.tasks.compileJava.outputs.files
@@ -884,23 +887,9 @@ class BuildPlugin implements Plugin<Project> {
 
     /** Configures the test task */
     static Task configureTest(Project project) {
-        RandomizedTestingTask test = project.tasks.getByName('test')
-        test.configure(commonTestConfig(project))
-        test.configure {
+        project.tasks.getByName('test') {
             include '**/*Tests.class'
         }
-
-        // Add a method to create additional unit tests for a project, which will share the same
-        // randomized testing setup, but by default run no tests.
-        project.extensions.add('additionalTest', { String name, Closure config ->
-            RandomizedTestingTask additionalTest = project.tasks.create(name, RandomizedTestingTask.class)
-            additionalTest.classpath = test.classpath
-            additionalTest.testClassesDirs = test.testClassesDirs
-            additionalTest.configure(commonTestConfig(project))
-            additionalTest.configure(config)
-            additionalTest.dependsOn(project.tasks.testClasses)
-            project.check.dependsOn(additionalTest)
-        });
     }
 
     private static configurePrecommit(Project project) {

buildSrc/src/main/groovy/org/elasticsearch/gradle/test/ClusterConfiguration.groovy

@@ -68,7 +68,9 @@ class ClusterConfiguration {
      * In case of more than one node, this defaults to the number of nodes
      */
     @Input
-    Closure<Integer> minimumMasterNodes = { getNumNodes() > 1 ? getNumNodes() : -1 }
+    Closure<Integer> minimumMasterNodes = {
+        return getNumNodes() > 1 ? getNumNodes() : -1
+    }
 
     @Input
     String jvmArgs = "-Xms" + System.getProperty('tests.heap.size', '512m') +

buildSrc/src/main/groovy/org/elasticsearch/gradle/test/ClusterFormationTasks.groovy

@@ -122,8 +122,31 @@ class ClusterFormationTasks {
             }
             NodeInfo node = new NodeInfo(config, i, project, prefix, elasticsearchVersion, sharedDir)
             nodes.add(node)
-            Object dependsOn = startTasks.empty ? startDependencies : startTasks.get(0)
-            startTasks.add(configureNode(project, prefix, runner, dependsOn, node, config, distro, nodes.get(0)))
+            Closure<Map> writeConfigSetup
+            Object dependsOn
+            if (node.nodeVersion.onOrAfter("6.5.0-SNAPSHOT")) {
+                writeConfigSetup = { Map esConfig ->
+                    // Don't force discovery provider if one is set by the test cluster specs already
+                    if (esConfig.containsKey('discovery.zen.hosts_provider') == false) {
+                        esConfig['discovery.zen.hosts_provider'] = 'file'
+                    }
+                    esConfig['discovery.zen.ping.unicast.hosts'] = []
+                    esConfig
+                }
+                dependsOn = startDependencies
+            } else {
+                dependsOn = startTasks.empty ? startDependencies : startTasks.get(0)
+                writeConfigSetup = { Map esConfig ->
+                    String unicastTransportUri = node.config.unicastTransportUri(nodes.get(0), node, project.ant)
+                    if (unicastTransportUri == null) {
+                        esConfig['discovery.zen.ping.unicast.hosts'] = []
+                    } else {
+                        esConfig['discovery.zen.ping.unicast.hosts'] = "\"${unicastTransportUri}\""
+                    }
+                    esConfig
+                }
+            }
+            startTasks.add(configureNode(project, prefix, runner, dependsOn, node, config, distro, writeConfigSetup))
         }
 
         Task wait = configureWaitTask("${prefix}#wait", project, nodes, startTasks, config.nodeStartupWaitSeconds)
@@ -182,7 +205,7 @@ class ClusterFormationTasks {
      * @return a task which starts the node.
      */
     static Task configureNode(Project project, String prefix, Task runner, Object dependsOn, NodeInfo node, ClusterConfiguration config,
-                              Configuration distribution, NodeInfo seedNode) {
+                              Configuration distribution, Closure<Map> writeConfig) {
 
         // tasks are chained so their execution order is maintained
         Task setup = project.tasks.create(name: taskName(prefix, node, 'clean'), type: Delete, dependsOn: dependsOn) {
@@ -198,7 +221,7 @@ class ClusterFormationTasks {
         setup = configureCheckPreviousTask(taskName(prefix, node, 'checkPrevious'), project, setup, node)
         setup = configureStopTask(taskName(prefix, node, 'stopPrevious'), project, setup, node)
         setup = configureExtractTask(taskName(prefix, node, 'extract'), project, setup, node, distribution)
-        setup = configureWriteConfigTask(taskName(prefix, node, 'configure'), project, setup, node, seedNode)
+        setup = configureWriteConfigTask(taskName(prefix, node, 'configure'), project, setup, node, writeConfig)
         setup = configureCreateKeystoreTask(taskName(prefix, node, 'createKeystore'), project, setup, node)
         setup = configureAddKeystoreSettingTasks(prefix, project, setup, node)
         setup = configureAddKeystoreFileTasks(prefix, project, setup, node)
@@ -301,7 +324,7 @@ class ClusterFormationTasks {
     }
 
     /** Adds a task to write elasticsearch.yml for the given node configuration */
-    static Task configureWriteConfigTask(String name, Project project, Task setup, NodeInfo node, NodeInfo seedNode) {
+    static Task configureWriteConfigTask(String name, Project project, Task setup, NodeInfo node, Closure<Map> configFilter) {
         Map esConfig = [
                 'cluster.name'                 : node.clusterName,
                 'node.name'                    : "node-" + node.nodeNum,
@@ -347,10 +370,7 @@ class ClusterFormationTasks {
 
         Task writeConfig = project.tasks.create(name: name, type: DefaultTask, dependsOn: setup)
         writeConfig.doFirst {
-            String unicastTransportUri = node.config.unicastTransportUri(seedNode, node, project.ant)
-            if (unicastTransportUri != null) {
-                esConfig['discovery.zen.ping.unicast.hosts'] = "\"${unicastTransportUri}\""
-            }
+            esConfig = configFilter.call(esConfig)
             File configFile = new File(node.pathConf, 'elasticsearch.yml')
             logger.info("Configuring ${configFile}")
             configFile.setText(esConfig.collect { key, value -> "${key}: ${value}" }.join('\n'), 'UTF-8')
@@ -681,6 +701,19 @@ class ClusterFormationTasks {
     static Task configureWaitTask(String name, Project project, List<NodeInfo> nodes, List<Task> startTasks, int waitSeconds) {
         Task wait = project.tasks.create(name: name, dependsOn: startTasks)
         wait.doLast {
+
+            Collection<String> unicastHosts = new HashSet<>()
+            nodes.forEach { otherNode ->
+                String unicastHost = otherNode.config.unicastTransportUri(otherNode, null, project.ant)
+                if (unicastHost != null) {
+                    unicastHosts.addAll(Arrays.asList(unicastHost.split(",")))
+                }
+            }
+            String unicastHostsTxt = String.join("\n", unicastHosts)
+            nodes.forEach { node ->
+                node.pathConf.toPath().resolve("unicast_hosts.txt").setText(unicastHostsTxt)
+            }
+
             ant.waitfor(maxwait: "${waitSeconds}", maxwaitunit: 'second', checkevery: '500', checkeveryunit: 'millisecond', timeoutproperty: "failed${name}") {
                 or {
                     for (NodeInfo node : nodes) {

buildSrc/src/main/groovy/org/elasticsearch/gradle/test/RestIntegTestTask.groovy

@@ -64,8 +64,6 @@ public class RestIntegTestTask extends DefaultTask {
         runner.testClassesDirs = project.sourceSets.test.output.classesDirs
         clusterConfig = project.extensions.create("${name}Cluster", ClusterConfiguration.class, project)
 
-        // start with the common test configuration
-        runner.configure(BuildPlugin.commonTestConfig(project))
         // override/add more for rest tests
         runner.parallelism = '1'
         runner.include('**/*IT.class')

buildSrc/src/main/groovy/org/elasticsearch/gradle/test/StandaloneRestTestPlugin.groovy

@@ -50,6 +50,7 @@ public class StandaloneRestTestPlugin implements Plugin<Project> {
         project.getTasks().create("buildResources", ExportElasticsearchBuildResourcesTask)
         BuildPlugin.globalBuildInfo(project)
         BuildPlugin.configureRepositories(project)
+        BuildPlugin.applyCommonTestConfig(project)
 
         // only setup tests to build
         project.sourceSets.create('test')

buildSrc/src/main/groovy/org/elasticsearch/gradle/test/StandaloneTestPlugin.groovy

@@ -24,7 +24,6 @@ import org.elasticsearch.gradle.BuildPlugin
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.plugins.JavaBasePlugin
-import org.gradle.api.tasks.compile.JavaCompile
 
 /**
  * Configures the build to compile against Elasticsearch's test framework and
@@ -44,7 +43,6 @@ public class StandaloneTestPlugin implements Plugin<Project> {
             description: 'Runs unit tests that are separate'
         ]
         RandomizedTestingTask test = project.tasks.create(testOptions)
-        test.configure(BuildPlugin.commonTestConfig(project))
         BuildPlugin.configureCompile(project)
         test.classpath = project.sourceSets.test.runtimeClasspath
         test.testClassesDirs = project.sourceSets.test.output.classesDirs

buildSrc/src/main/java/org/elasticsearch/gradle/testclusters/TestClustersPlugin.java

@@ -39,8 +39,8 @@
 
 public class TestClustersPlugin implements Plugin<Project> {
 
-    public static final String LIST_TASK_NAME = "listElasticSearchClusters";
-    public static final String EXTENSION_NAME = "elasticSearchClusters";
+    private static final String LIST_TASK_NAME = "listTestClusters";
+    private static final String NODE_EXTENSION_NAME = "testClusters";
 
     private final Logger logger =  Logging.getLogger(TestClustersPlugin.class);
 
@@ -50,7 +50,7 @@ public void apply(Project project) {
             ElasticsearchNode.class,
             (name) -> new ElasticsearchNode(name, GradleServicesAdapter.getInstance(project))
         );
-        project.getExtensions().add(EXTENSION_NAME, container);
+        project.getExtensions().add(NODE_EXTENSION_NAME, container);
 
         Task listTask = project.getTasks().create(LIST_TASK_NAME);
         listTask.setGroup("ES cluster formation");