Is there a OOTB functionality to empty the contents of KC or to get all the top

1. You can use the Content Functions as an example to create your own custom function plug-in to retrieve all folders from a KC. Here's an example:

@Function
@FolderDataType
public Long[] GetAllFoldersFromKC(ServiceContext sc, ContentService cs, @Parameter(required=true) @KnowledgeCenterDataType Long knowledgeCenter) {
ContentFilter cf = new ContentFilter(ContentConstants.TYPE_FOLDER);
return cs.getAllChildrenIds(knowledgeCenter, cf, ContentConstants.GC_MOD_NORMAL);
}


2. Then you can pass the result of calling this function to the Empty Folder smart service available in the second plug-in from my post

3. You can now use the Delete Folder smart service to delete the empty folders that function #1 will return.

Or you can merge these three things in your own custom smart service called "Empty KC"

1. You can use the Content Functions as an example to create your own custom function plug-in to retrieve all folders from a KC. Here's an example:

@Function
@FolderDataType
public Long[] GetAllFoldersFromKC(ServiceContext sc, ContentService cs, @Parameter(required=true) @KnowledgeCenterDataType Long knowledgeCenter) {
ContentFilter cf = new ContentFilter(ContentConstants.TYPE_FOLDER);
return cs.getAllChildrenIds(knowledgeCenter, cf, ContentConstants.GC_MOD_NORMAL);
}


2. Then you can pass the result of calling this function to the Empty Folder smart service available in the second plug-in from my post

3. You can now use the Delete Folder smart service to delete the empty folders that function #1 will return.

Or you can merge these three things in your own custom smart service called "Empty KC"