Describe the bug

With #3185 we can validate values strictly. There are other areas of improvement to implement this for example:

public function get_last_cli_sync( $args, $assoc_args ) {

	$last_sync = Utils\get_option( 'ep_last_cli_index', array() );

	if ( isset( $assoc_args['clear'] ) ) {
		Utils\delete_option( 'ep_last_cli_index' );
	}

	$this->pretty_json_encode( $last_sync, $this->filter_boolean( $assoc_args['pretty'] ) );
}

As of now, the original problem we were solving for the pretty flag seems to be true for other scenarios like this.

Steps to Reproduce

1.- Pass any value to the --clear flag for get-last-cli-sync
2.- It should delete the ep_last_cli_index option

Screenshots, screen recording, code snippet

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Environment information

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WordPress and ElasticPress information

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