ajax issues

(function($){	
    $(document).ready(function(){
        $('a').click(function(e){
          var el = $(this).prev('input[type="checkbox"]');
          if(el.is(':checked')){
               el.prop('checked',false);   
          }
          $.ajax({
              url  : 'http://localhost/wordpress/wp-admin/admin-ajax.php',
              type : 'POST',
              data : { 
                  action : 'uncheck_package',
                  element_value : el.val()
              },      
              success: function(result){
                console.log(result);
              },
              error: function(jqXHR, textStatus, errorThrown ){
                console.log(jqXHR, textStatus, errorThrown);
              } 
          })
          e.preventDefault();
        });
    }); 
 })(jQuery);


<?php
function uncheck_package(){
    if(isset($_POST['element_value'])){
        $element = $_POST['element_value'];
    }
    
    if(isset($element)){
        $option = get_option('aisis_options');
        if(isset($option[$element])){
            $option[$element] = 'test';
            echo json_encode(update_option('aisis_options', $option));
            exit;
        }
    }
}

add_action( 'wp_ajax_nopriv_uncheck_package', 'uncheck_package' );  
add_action( 'wp_ajax_uncheck_package', 'uncheck_package' );  

// Out put - in the order of the above var-dumps, echos and final var_dump
//This is as top down as it gets.

print_r($option[$element])
package_RelatedPosts

//echo json_encode(update_option($option[$element], 'test'))
true

//print_r($option)
Array
(
    [category_header] => 
    [author_posts] => 
    [tag_header] => 
    [carousel_global] => 
    [carousel_home] => 
    [carousel_single] => 
    [mini_feed_global] => 
    [mini_feed_home] => 
    [mini_feed_single] => 
    [author_image] => 
    [author_bio] => 
    [author_sidebar] => 
    [jumbotron] => 
    [socialbar] => 
    [category_description] => 
    [category_tags] => 
    [category_sidebar] => 
    [tag_description] => 
    [tag_sidebar] => 
    [twitter_admin] => 
    [package_Aisis-Related-Posts-Package-master] => package_Aisis-Related-Posts-Package-master
    [package_RelatedPosts] => package_RelatedPosts // -> should be test
    [package_TextShortCodes] => package_TextShortCodes
    [lists_more_posts] => 
    [lists_more_posts_rows] => 
    [jumbo_title] => 
    [jumbo_text] => 
    [jumbo_image] => 
    [jumbo_link] => 
    [social] => Array
        (
            [facebook] => 
            [twitter] => 
            [google-plus] => 
            [linkedin] => 
            [github] => 
        )

    [footer_text] => 
)

0  //WP -Ajax Return