Rename instances of elasticsearch to opensearch

Signed-off-by: Rabi Panda <adnapibar@gmail.com>

client/rest/build.gradle

@@ -18,14 +18,14 @@ import de.thetaphi.forbiddenapis.gradle.CheckForbiddenApis
  * specific language governing permissions and limitations
  * under the License.
  */
-apply plugin: 'elasticsearch.build'
-apply plugin: 'elasticsearch.publish'
+apply plugin: 'opensearch.build'
+apply plugin: 'opensearch.publish'
 
 targetCompatibility = JavaVersion.VERSION_1_8
 sourceCompatibility = JavaVersion.VERSION_1_8
 
-group = 'org.elasticsearch.client'
-archivesBaseName = 'elasticsearch-rest-client'
+group = 'org.opensearch.client'
+archivesBaseName = 'opensearch-rest-client'
 
 dependencies {
   api "org.apache.httpcomponents:httpclient:${versions.httpclient}"
@@ -39,8 +39,8 @@ dependencies {
   testImplementation "com.carrotsearch.randomizedtesting:randomizedtesting-runner:${versions.randomizedrunner}"
   testImplementation "junit:junit:${versions.junit}"
   testImplementation "org.hamcrest:hamcrest:${versions.hamcrest}"
-  testImplementation "org.elasticsearch:securemock:${versions.securemock}"
-  testImplementation "org.elasticsearch:mocksocket:${versions.mocksocket}"
+  testImplementation "org.opensearch:securemock:${versions.securemock}"
+  testImplementation "org.opensearch:mocksocket:${versions.mocksocket}"
 }
 
 tasks.withType(CheckForbiddenApis).configureEach {
@@ -59,14 +59,14 @@ tasks.named('forbiddenApisTest').configure {
 }
 
 // JarHell is part of es server, which we don't want to pull in
-// TODO: Not anymore. Now in :libs:elasticsearch-core
+// TODO: Not anymore. Now in :libs:opensearch-core
 jarHell.enabled = false
 
 testingConventions {
   naming.clear()
   naming {
     Tests {
-      baseClass 'org.elasticsearch.client.RestClientTestCase'
+      baseClass 'org.opensearch.client.RestClientTestCase'
     }
   }
 }

client/rest/src/main/java/org/opensearch/client/Response.java

@@ -33,7 +33,7 @@
 import java.util.regex.Pattern;
 
 /**
- * Holds an elasticsearch response. It wraps the {@link HttpResponse} returned and associates it with
+ * Holds an opensearch response. It wraps the {@link HttpResponse} returned and associates it with
  * its corresponding {@link RequestLine} and {@link HttpHost}.
  */
 public class Response {

client/rest/src/main/java/org/opensearch/client/ResponseException.java

@@ -27,7 +27,7 @@
 import java.util.Locale;
 
 /**
- * Exception thrown when an elasticsearch node responds to a request with a status code that indicates an error.
+ * Exception thrown when an opensearch node responds to a request with a status code that indicates an error.
  * Holds the response that was returned.
  */
 public final class ResponseException extends IOException {