Make the plugin compatible with 2.x.

Signed-off-by: dblock <[email protected]>

README.md

@@ -12,7 +12,7 @@ Build a distribution.
 ./gradlew assemble
 ```
 
-This produces `./build/distributions/opensearch-api-3.0.0.0-SNAPSHOT.zip`.
+This produces `./build/distributions/opensearch-api-2.12.0.0-SNAPSHOT.zip`.
 
 ### Install
 
@@ -21,7 +21,7 @@ Check out OpenSearch code, run it once with `./gradlew run`.
 Install the plugin, you may need to adjust `darwin-arm64-tar` below to your platform, and use the location of your plugin zip (mine is `~/source/opensearch-project/opensearch-api/dblock-opensearch-api`).
 
 ```sh
-$ ./distribution/archives/darwin-arm64-tar/build/install/opensearch-3.0.0-SNAPSHOT/bin/opensearch-plugin install file:///Users/dblock/source/opensearch-project/opensearch-api/dblock-opensearch-api/build/distributions/opensearch-api-3.0.0.0-SNAPSHOT.zip
+$ ./distribution/archives/darwin-arm64-tar/build/install/opensearch-2.12.0-SNAPSHOT/bin/opensearch-plugin install file:///Users/dblock/source/opensearch-project/opensearch-api/dblock-opensearch-api/build/distributions/opensearch-api-2.12.0.0-SNAPSHOT.zip
 
 -> Installed opensearch-api with folder name opensearch-api
 ```
@@ -46,7 +46,7 @@ Returns an OpenAPI spec.
  "info": {
  "title": "opensearch",
  "description": "The OpenSearch Project: https://opensearch.org/",
- "version": "3.0.0-SNAPSHOT"
+ "version": "2.12.0-SNAPSHOT"
  },
  ...
 }
@@ -55,7 +55,7 @@ Returns an OpenAPI spec.
 ### Uninstall
 
 ```sh
-./distribution/archives/darwin-arm64-tar/build/install/opensearch-3.0.0-SNAPSHOT/bin/opensearch-plugin remove opensearch-api
+./distribution/archives/darwin-arm64-tar/build/install/opensearch-2.12.0-SNAPSHOT/bin/opensearch-plugin remove opensearch-api
 
 -> removing [opensearch-api]...
 ```

build.gradle

@@ -14,7 +14,7 @@ def pluginClassName = 'APIPlugin'
 
 buildscript {
  ext {
- opensearch_version = System.getProperty("opensearch.version", "3.0.0-SNAPSHOT")
+ opensearch_version = System.getProperty("opensearch.version", "2.12.0-SNAPSHOT")
  isSnapshot = "true" == System.getProperty("build.snapshot", "true")
  }
 

src/test/java/org/opensearch/plugin/api/APIPluginIT.java

@@ -9,8 +9,7 @@
 
 import com.carrotsearch.randomizedtesting.annotations.ThreadLeakScope;
 
-import org.apache.hc.core5.http.ParseException;
-import org.apache.hc.core5.http.io.entity.EntityUtils;
+import org.apache.http.util.EntityUtils;
 import org.opensearch.client.Request;
 import org.opensearch.client.Response;
 import org.opensearch.plugins.Plugin;
@@ -30,15 +29,15 @@ protected Collection<Class<? extends Plugin>> nodePlugins() {
  return Collections.singletonList(APIPlugin.class);
  }
 
- public void testPluginInstalled() throws IOException, ParseException {
+ public void testPluginInstalled() throws IOException {
  Response response = getRestClient().performRequest(new Request("GET", "/_cat/plugins"));
  String body = EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8);
 
- logger.info("response body: {}", body.toString());
+ logger.info("response body: {}", body);
  assertTrue(body.contains("api"));
  }
 
- public void testPluginGetAPI() throws IOException, ParseException {
+ public void testPluginGetAPI() throws IOException {
  Response response = getRestClient().performRequest(new Request("GET", "/_plugins/api"));
  String body = EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8);
  logger.info("response body: {}", body);