SOLR-14673: Add bin/solr stream CLI (apache#2479)

* Allows you to run a streaming expression on the Solr server, using the /stream end point.
* Allows you to run a streaming expression locally, by specifying --execution=local.

solr/CHANGES.txt

@@ -12,6 +12,8 @@ New Features
 
 * SOLR-17467: Solr CLI bin/solr start defaults to starting Solr in Cloud mode, use --user-managed switch for User Managed (aka Standalone) mode.  (Eric Pugh)
 
+* SOLR-14673: Solr CLI now has bin/solr stream tool that executates streaming expressions via command line, either locally or on solr cluster. (Eric Pugh)
+
 Improvements
 ---------------------
 

solr/bin/solr.cmd

@@ -1175,9 +1175,9 @@ for %%a in (%*) do (
    ) else (
       set "option!option!=%%a"
       if "!option!" equ "-s" set "SOLR_HOME=%%a"
-      if "!option!" equ "--solr-home" set "SOLR_HOME=%%a"        
+      if "!option!" equ "--solr-home" set "SOLR_HOME=%%a"
       if "!option!" equ "-d" set "SOLR_SERVER_DIR=%%a"
-      if "!option!" equ "--server-dir" set "SOLR_SERVER_DIR=%%a"    
+      if "!option!" equ "--server-dir" set "SOLR_SERVER_DIR=%%a"
       if not "!option!" equ "-s" if not "!option!" equ "--solr-home" if not "!option!" equ "-d" if not "!option!" equ "--server-dir" (
         set "AUTH_PARAMS=!AUTH_PARAMS! !option! %%a"
       )

solr/core/src/java/org/apache/solr/cli/SolrCLI.java

@@ -246,6 +246,7 @@ private static Tool newTool(String toolType) throws Exception {
     else if ("post".equals(toolType)) return new PostTool();
     else if ("postlogs".equals(toolType)) return new PostLogsTool();
     else if ("version".equals(toolType)) return new VersionTool();
+    else if ("stream".equals(toolType)) return new StreamTool();
     else if ("snapshot-create".equals(toolType)) return new SnapshotCreateTool();
     else if ("snapshot-delete".equals(toolType)) return new SnapshotDeleteTool();
     else if ("snapshot-list".equals(toolType)) return new SnapshotListTool();
@@ -511,8 +512,7 @@ private static void printHelp() {
     print("Usage: solr COMMAND OPTIONS");
     print("       where COMMAND is one of: start, stop, restart, status, ");
     print(
-        "                                healthcheck, create, delete, auth, assert, config, export, api, package, post, ");
-
+        "                                healthcheck, create, delete, auth, assert, config, export, api, package, post, stream,");
     print(
         "                                zk ls, zk cp, zk rm , zk mv, zk mkroot, zk upconfig, zk downconfig,");
     print(