Error when indexing

[thesquaremedia]

There was a problem indexing the data. (Content-Type header [application/x-www-form-urlencoded] is not supported) any idea of how to solve it?

[thesquaremedia]

updating this fixed that

static function _client($write = false)
	{
		$settings = array(
			'url' => Config::option('server_url'),
			"headers" => array("Content-Type" => "application/json")
		);

		if ($write) {
			$settings['timeout'] = Config::option('server_timeout_write') ?: 300;
		} else {
			$settings['timeout'] = Config::option('server_timeout_read') ?: 1;
		}

		// Allow custom settings to be passed by users who want to.
		$settings = apply_filters('indexer_client_settings', $settings);

		return new \Elastica\Client($settings);
	}

now I am getting this though There was a problem indexing the data. (failed to parse [post_date])

[thesquaremedia]

so after trying to make it work. it seems the reason I get errors is becuase the plugin isnt compatible with the latest version of elastic search 6.x specially with the changes in multiple index types.