Revert "[Backport] [2.x] Restore support for Java 8 (#767) (#777)" (#800

)

This reverts commit 081a17e.

Signed-off-by: Andriy Redko <andriy.redko@aiven.io>

CHANGELOG.md

@@ -13,7 +13,6 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Bumps `org.apache.httpcomponents.client5:httpclient5` from 5.2.1 to 5.3
 
 ### Changed
-- Restore support for Java 8 ([#767](https://github.com/opensearch-project/opensearch-java/pull/767))
 
 ### Deprecated
 

COMPATIBILITY.md

@@ -19,7 +19,7 @@ The below matrix shows the compatibility of the [`opensearch-java-client`](https
 | Client Version | JDK                |
 |----------------|--------------------|
 | 1.0.0          | 8                  |
-| 2.x.0          | 8 / 11 / 17 / 21   |
+| 2.x.0          | 11 / 17 / 21       |
 
 ## Upgrading
 

java-client/build.gradle.kts

@@ -61,8 +61,8 @@ configurations {
 }
 
 java {
-    targetCompatibility = JavaVersion.VERSION_1_8
-    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_11
+    sourceCompatibility = JavaVersion.VERSION_11
 
     withJavadocJar()
     withSourcesJar()
@@ -146,20 +146,15 @@ val integrationTest = task<Test>("integrationTest") {
             System.getProperty("tests.awsSdk2support.domainRegion", "us-east-1"))
 }
 
-val opensearchVersion = "2.12.0-SNAPSHOT"
-
 dependencies {
 
+    val opensearchVersion = "2.7.0"
     val jacksonVersion = "2.15.2"
     val jacksonDatabindVersion = "2.15.2"
 
     // Apache 2.0
     implementation("org.opensearch.client", "opensearch-rest-client", opensearchVersion)
     testImplementation("org.opensearch.test", "framework", opensearchVersion)
-    testImplementation("org.hamcrest:hamcrest:2.2")
-    testImplementation("com.carrotsearch.randomizedtesting:randomizedtesting-runner:2.8.1") {
-        exclude(group = "junit")
-    }
 
     // Apache 2.0
     // https://search.maven.org/artifact/com.google.code.findbugs/jsr305
@@ -332,38 +327,3 @@ publishing {
         }
     }
 }
-
-if (JavaVersion.current() >= JavaVersion.VERSION_11) {
-  val java11: SourceSet = sourceSets.create("java11") {
-    java {
-      compileClasspath += sourceSets.main.get().output + sourceSets.test.get().output
-      runtimeClasspath += sourceSets.main.get().output + sourceSets.test.get().output
-      srcDir("src/test/java11")
-    }
-  }
-
-  configurations[java11.implementationConfigurationName].extendsFrom(configurations.testImplementation.get())
-  configurations[java11.runtimeOnlyConfigurationName].extendsFrom(configurations.testRuntimeOnly.get())
-
-  dependencies {
-    testImplementation("org.opensearch.test", "framework", opensearchVersion) {
-      exclude(group = "org.hamcrest")
-    }
-  }
-
-  tasks.named<JavaCompile>("compileJava11Java") {
-    targetCompatibility = JavaVersion.VERSION_11.toString()
-    sourceCompatibility = JavaVersion.VERSION_11.toString()
-  }
-
-  tasks.named<JavaCompile>("compileTestJava") {
-    targetCompatibility = JavaVersion.VERSION_11.toString()
-    sourceCompatibility = JavaVersion.VERSION_11.toString()
-  }
-
-  tasks.test {
-    testClassesDirs += java11.output.classesDirs
-    classpath = sourceSets["java11"].runtimeClasspath
-  }
-
-}