Build: Upgrade min gradle to 3.3 (#23544)

This will allow us to get rid of deprecation warnings that appear when
using 3.3, and also get rid of extra logic for 2.13 required because of
the progress logger.

CONTRIBUTING.md

@@ -88,8 +88,8 @@ Contributing to the Elasticsearch codebase
 **Repository:** [https://github.com/elastic/elasticsearch](https://github.com/elastic/elasticsearch)
 
 Make sure you have [Gradle](http://gradle.org) installed, as
-Elasticsearch uses it as its build system. Gradle must be version 2.13 _exactly_ in
-order to build successfully.
+Elasticsearch uses it as its build system. Gradle must be at least
+version 3.3 in order to build successfully.
 
 Eclipse users can automatically configure their IDE: `gradle eclipse`
 then `File: Import: Existing Projects into Workspace`. Select the

README.textile

@@ -200,7 +200,7 @@ We have just covered a very small portion of what Elasticsearch is all about. Fo
 
 h3. Building from Source
 
-Elasticsearch uses "Gradle":https://gradle.org for its build system. You'll need to have version 2.13 of Gradle installed.
+Elasticsearch uses "Gradle":https://gradle.org for its build system. You'll need to have at least version 3.3 of Gradle installed.
 
 In order to create a distribution, simply run the @gradle assemble@ command in the cloned directory.
 

buildSrc/build.gradle

@@ -23,8 +23,8 @@ apply plugin: 'groovy'
 
 group = 'org.elasticsearch.gradle'
 
-if (GradleVersion.current() < GradleVersion.version('2.13')) {
-  throw new GradleException('Gradle 2.13+ is required to build elasticsearch')
+if (GradleVersion.current() < GradleVersion.version('3.3')) {
+  throw new GradleException('Gradle 3.3+ is required to build elasticsearch')
 }
 
 if (JavaVersion.current() < JavaVersion.VERSION_1_8) {

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

@@ -122,7 +122,7 @@ class BuildPlugin implements Plugin<Project> {
             }
 
             // enforce gradle version
-            GradleVersion minGradle = GradleVersion.version('2.13')
+            GradleVersion minGradle = GradleVersion.version('3.3')
             if (GradleVersion.current() < minGradle) {
                 throw new GradleException("${minGradle} or above is required to build elasticsearch")
             }