0.19.4 is out. You can download it here. The release includes serveral bug fixes, mainly around percolator,
_default_ mapping type, and file based config index templates.
It also includes an enahcement allowing to configure the
query_string query to be
lenient, not failing when wrong format of a value is provided (for example, a text to a numeric field), as well as the ability to search “within” objects using wildcards in the
query_string syntax (it was already provided if it was used in the
fields section), for example: