When an extracted property is taggable, it is possible to automatically extract tags from the value. By default, this is disabled, but may be enabled by adding sys:enableStringTagging= true to the Map returned from the extractMetadata method.
Assuming enableStringTagging is true, it is also possible to change the default separators of the tags in the value. The default separators are , ; and \|. This is done by adding a sys:stringTaggingSeparators value to the Map returned from the extractMetadata method. Please note that escaping of characters takes place in both Java and json, so json response would look like "sys:stringTaggingSeparators": ";,\",\",\\|" if the code explicitly sets the default separators.