Version 4.7.6

system/Content/Search/Elastic/Query.php

@@ -390,10 +390,24 @@ class _Query extends \IPS\Content\Search\Query
 		/* Some container types cannot be cached */
 		$classes = [];
 		$conditions = [];
+		$noSimilarContentClasses = [];
 
 		foreach ( \IPS\Application::allExtensions( 'core', 'ContentRouter', FALSE ) as $object )
 		{
 			$classes = array_merge( $object->classes, $classes );
+
+			if ( ! $object->similarContent )
+			{
+				foreach( $object->classes as $class )
+				{
+					$noSimilarContentClasses[] = $class;
+
+					if ( is_subclass_of( $class, 'IPS\Content\Item' ) and isset( $class::$commentClass ) )
+					{
+						$noSimilarContentClasses[] = $class::$commentClass;
+					}
+				}
+			}
 		}
 
 		/* Some nodes have complex permissions, so avoid any permission issues by not selecting these */
@@ -440,6 +454,20 @@ class _Query extends \IPS\Content\Search\Query
 			}
 		}
 
+		/* Prevent some things from being in similar content widget */
+		if ( \count( $noSimilarContentClasses ) )
+		{
+			$this->mustNot[] = array(
+				'bool' => array(
+					'filter' => array(
+						array(
+							'terms' => array( 'index_class' => $noSimilarContentClasses )
+						)
+					)
+				)
+			);
+		}
+
 		/* Only show non-hidden and approved items */
 		$this->setHiddenFilter( static::HIDDEN_VISIBLE );
 	}