Support installing plugin SNAPSHOTs with SNASPHOT distribution

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

Author: reta

distribution/tools/plugin-cli/src/main/java/org/opensearch/plugins/InstallPluginCommand.java

@@ -137,8 +137,6 @@
  */
 class InstallPluginCommand extends EnvironmentAwareCommand {
 
-    private static final String PROPERTY_STAGING_ID = "opensearch.plugins.staging";
-
     // exit codes for install
     /** A plugin with the same name is already installed. */
     static final int PLUGIN_EXISTS = 1;
@@ -309,7 +307,6 @@ private Path download(Terminal terminal, String pluginId, Path tmpDir, boolean i
         if (OFFICIAL_PLUGINS.contains(pluginId)) {
             final String url = getOpenSearchUrl(
                 terminal,
-                getStagingHash(),
                 Version.CURRENT,
                 isSnapshot(),
                 pluginId,
@@ -341,38 +338,31 @@ private Path download(Terminal terminal, String pluginId, Path tmpDir, boolean i
         return downloadZip(terminal, pluginId, tmpDir, isBatch);
     }
 
-    // pkg private so tests can override
-    String getStagingHash() {
-        return System.getProperty(PROPERTY_STAGING_ID);
-    }
-
     boolean isSnapshot() {
         return Build.CURRENT.isSnapshot();
     }
 
     /** Returns the url for an official opensearch plugin. */
     private String getOpenSearchUrl(
         final Terminal terminal,
-        final String stagingHash,
         final Version version,
         final boolean isSnapshot,
         final String pluginId,
         final String platform
     ) throws IOException, UserException {
         final String baseUrl;
-        if (isSnapshot && stagingHash == null) {
+        if (isSnapshot == false && version.isRelease() == false) {
             throw new UserException(
                 ExitCodes.CONFIG,
                 "attempted to install release build of official plugin on snapshot build of OpenSearch"
             );
         }
-        if (stagingHash != null) {
+        if (isSnapshot == true) {
             baseUrl = String.format(
                 Locale.ROOT,
-                "https://artifacts.opensearch.org/snapshots/plugins/%s/%s-%s",
+                "https://artifacts.opensearch.org/snapshots/plugins/%s/%s",
                 pluginId,
-                version,
-                stagingHash
+                version + "-SNAPSHOT"
             );
         } else {
             baseUrl = String.format(