Fail build on missing Javadocs

build.gradle

@@ -24,11 +24,12 @@ ext {
 
 apply plugin: 'application'
 apply from: 'gradle/formatting.gradle'
+apply from: 'gradle/missing-javadoc.gradle'
 
 mainClassName = 'org.opensearch.sdk.ExtensionsRunner'
 
-group 'org.example'
-version '1.0-SNAPSHOT'
+group 'org.opensearch.sdk'
+version '1.0.0-SNAPSHOT'
 
 repositories {
     mavenLocal()
@@ -65,6 +66,16 @@ dependencies {
 
 }
 
+task javadocStrict(type: Javadoc) {
+  group = 'Documentation'
+  description = 'Run Javadoc in strict mode: with -Xdoclint:all and -Xwerror, on all members.'
+  source = sourceSets.main.allJava
+  classpath = sourceSets.main.runtimeClasspath
+  options.addStringOption('Xwerror', '-Xdoclint:all')
+  options.memberLevel = JavadocMemberLevel.PACKAGE
+}
+check.dependsOn javadocStrict
+
 test {
     useJUnitPlatform()
     jvmArgs '--enable-preview'

doc-tools/build.gradle

@@ -0,0 +1,10 @@
+plugins {
+    id 'java'
+}
+
+group 'org.opensearch.sdk'
+version '1.0.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}

doc-tools/missing-doclet/build.gradle

@@ -0,0 +1,16 @@
+plugins {
+  id 'java-library'
+}
+
+group 'org.opensearch.sdk'
+version '1.0.0-SNAPSHOT'
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+tasks.withType(JavaCompile) {
+  options.compilerArgs += ["--release", targetCompatibility.toString()]
+  options.encoding = "UTF-8"
+}