Merge pull request #20 from MeCapron/feature/add_backend_for_config_elastic

fix: adding forgotten backend model to decrypt config

Author: thomas-kl1

etc/config.xml

@@ -31,7 +31,7 @@
                 <index/>
                 <is_authentication_enabled>0</is_authentication_enabled>
                 <username/>
-                <password/>
+                <password backend_model="Magento\Config\Model\Config\Backend\Encrypted"/>
                 <ignore_error>1</ignore_error>
             </elasticsearch>
             <slack>