Custom Google Search Deprecated Function

Hello,

Is Custom Google Search still being actively developed or is it on a path to retirement?

On a WP 4.9.8 multiste network, Query Monitor reports:

query-monitor.js?ver=1544459176:314
{type: "deprecated", message: "Function create_function() is deprecated", file: "wp-content/plugins/custom-google-search/widget.php", line: 6, stack: Array(1), …}
component: "Plugin: custom-google-search"
file: "wp-content/plugins/custom-google-search/widget.php"
line: 6
message: "Function create_function() is deprecated"
stack: ["wp-content/plugins/custom-google-search/custom-google-search.php"]
type: "deprecated"
__proto__: Object

This message gets generated multiple times per page in admin.
Really cluttering up the browser console.

Will this be resolved?

Please advise.

Thanks!