diff --git a/Classes/Annotations/Mapping.php b/Classes/Annotations/Mapping.php
index e788c22..6a45e86 100644
--- a/Classes/Annotations/Mapping.php
+++ b/Classes/Annotations/Mapping.php
@@ -134,7 +134,10 @@ final class Mapping
     public function getPropertiesArray()
     {
         $properties = get_object_vars($this);
+
+        // Remove unsupported ES mapping properties. These properties are used internally only.
         unset($properties['fields']);
+        unset($properties['index_name']);
 
         return $properties;
     }
diff --git a/Classes/Mapping/EntityMappingBuilder.php b/Classes/Mapping/EntityMappingBuilder.php
index 0899c89..114ea23 100644
--- a/Classes/Mapping/EntityMappingBuilder.php
+++ b/Classes/Mapping/EntityMappingBuilder.php
@@ -131,7 +131,10 @@ protected function augmentMappingByProperty(Mapping $mapping, string $className,
                     if (isset($multiFields[$multiFieldIndexName])) {
                         throw new ElasticSearchException('Duplicate index name in the same multi field is not allowed "' . $className . '::' . $propertyName . '".');
                     }
-                    $multiFieldAnnotation->type = $mappingType;
+                    if (!$multiFieldAnnotation->type) {
+                        // Fallback to the parent's type if not specified on multi-field
+                        $multiFieldAnnotation->type = $mappingType;
+                    }
                     $multiFields[$multiFieldIndexName] = $this->processMappingAnnotation($multiFieldAnnotation);
                 }
                 $mapping->setPropertyByPath([$propertyName, 'fields'], $multiFields);