Previously, Elasticsearch recognized the strings
1 as booleans. Elasticsearch 6.0
recognizes only the strings
false as booleans and will throw an error otherwise. For backwards compatibility purposes, during the 6.x
series the previous coercion rules will continue to work on pre-6.0 indices. This means that you do not need to change affected existing
mappings immediately. However, it is not possible to create new indices from existing index templates that violate the strict
On new mappings, the
_all meta field that contains a copy of the text from
each field is now disabled by default. The
simple_query_string queries that previously used
_all to search will now
_all is enabled/disabled and switch to executing the query across all
_all is disabled.
_all can no longer be configured for indices
created with Elasticsearch version 6.0 or later.
_all field is now disabled by default and cannot be configured for
indices created with Elasticsearch 6.0 or later, the
include_in_all setting is
now disallowed for these indices' mappings.
Previously Elasticsearch would silently ignore any dynamic templates that
match_mapping_type type that was unrecognized. An exception is now
thrown on an unrecognized type.
locale option of
date fields previously allowed almost any string values,
and unrecognized values would simply be ignored. Unrecognized values are now
rejected on indices created with Elasticsearch 6.0 or newer.