[[breaking_changes]]
== Breaking changes from 6.x

### E_USER_DEPRECATED notice when using deprecated parameters

Starting from elasticsearch-php 7.4.0, we generate a PHP 
https://www.php.net/manual/en/errorfunc.constants.php[E_USER_DEPRECATED] notice 
every time you use a deprecated parameters for {es}. We decided to add this 
notice to facilitate the code refactoring with the new API specification of {es} 
(for example the usage of typeless APIs, see below).

From 7.4.1, we mitigated the usage of E_USER_DEPRICATED warning by using the `@` 
https://www.php.net/manual/en/language.operators.errorcontrol.php[operator]. The 
operator suppresses the error message, however, it is still possible to catch it 
by using a custom error handler:

[source,php]
----
set_error_handler(function ($errno, $errstr) {
    var_dump($errstr);
}, E_USER_DEPRECATED);

@trigger_error('Deprecation message here', E_USER_DEPRECATED);
----


### Moving from types to typeless APIs in {es} 7.0

{es} 7.0 deprecated APIs that accept types, introduced new typeless APIs, and 
removed support for the _default_ mapping. Read 
https://www.elastic.co/blog/moving-from-types-to-typeless-apis-in-elasticsearch-7-0[this]
blog post for more information.


### Type hint and return type

Added type hints and return type declarations in all the code base where 
possible. See PR https://github.com/elastic/elasticsearch-php/pull/897[#897].


### PHP 7.1+ Requirement

We require using PHP 7.1+ for elasticsearch-php. PHP 7.0 is not supported since
1st Jan 2019. Refer 
https://www.php.net/supported-versions.php[PHP supported version] for more 
information.
