Add option to enable logger and define logger class

[pierredup]

Fixes #118

Add the option to disable the logger and optionally specify the logger class.

The logger is enabled by default, but you can disable it per client by adding the enable_logger option:

fos_elastica:
    clients:
        default: { host: localhost, port: 9200, enable_logger : false}

You can also override the logger class by specifying a service id in the logger_class option:

fos_elastica:
    clients:
        default: { host: localhost, port: 9200, logger_class: my.logger.service.id }

This might not be the most elegant solution, but I'm open for ideas if somebody has a different implementation.

@todo: documentation

[merk]

We dont need 2 configuration parameters here.

1. Rename logger class to logger (it isnt a class in any case, but a service identifier)
2. Allow nulls and set the default to fos_elastica.logger, which would let the configuration look like:

Different logger:

fos_elastica:
    clients:
        default:
            host: localhost
            port: 9200
            logger: my.logger.service.id

Disable logger:

fos_elastica:
    clients:
        default:
            host: localhost
            port: 9200
            logger: false

[merk]

Null and true in the logger configuration should be considered to use the default logger service as well.

[jmikola]

Since the setLogger() method call is being added in the DI extension class (it's no longer hard-coded in the service definitions), we can simply omit the setLogger() call if the logger option is null or false. Changing the method to support a null argument shouldn't really be necessary.

[merk]

The thing is everything in the configuration treats null as true - but that can just be handled by the configuration class.

[pierredup]

@merk I have made the requested changes

[merk]

Thanks, final request could you please squash the commits?

[pierredup]

I actually tried, but for some reason screwed things up a bit. Will try again

[pierredup]

@merk squashed :)

[jmikola]

Extra closing brace here, or is it for the foreach and just not indented properly?

[pierredup]

I'm not sure where that extra bracket came from

[merk]

Thanks!

[makasim]

It seems I would have an error if I dont have the logger option set (I am updating the bundle from previous 3.0 version). I have next error while running ./app/console -vvv:

 [ErrorException]         
  Undefined index: logger

Exception trace:
 () at /home/skadabr/Projects/Remixcv/vendor/friendsofsymfony/elastica-bundle/FOS/ElasticaBundle/DependencyInjection/Configuration.php:81
 UniversalErrorCatcher_Catcher->handleError() at /home/skadabr/Projects/Remixcv/vendor/friendsofsymfony/elastica-bundle/FOS/ElasticaBundle/DependencyInjection/Configuration.php:81
 FOS\ElasticaBundle\DependencyInjection\Configuration->FOS\ElasticaBundle\DependencyInjection\{closure}() at n/a:n/a