Set default background threads to same as search threads

Signed-off-by: Simeon Widdis <[email protected]>

Author: Swiddis

plugin/src/main/java/org/opensearch/sql/plugin/SQLPlugin.java

@@ -328,7 +328,8 @@ public List<ExecutorBuilder<?>> getExecutorBuilders(Settings settings) {
         new FixedExecutorBuilder(
             settings,
             SQL_BACKGROUND_THREAD_POOL_NAME,
-            OpenSearchExecutors.allocatedProcessors(settings),
+            settings.getAsInt(
+                "thread_pool.search.size", OpenSearchExecutors.allocatedProcessors(settings)),
             1000,
             "thread_pool." + SQL_BACKGROUND_THREAD_POOL_NAME));
   }