Elasticsearch：更新索引分析器后，索引需要一个reindex吗？(Elasticsearch: After update index analyzer, index need a reindex?)

 将日期选择器初始化调用包装在document.ready中。 这个代码在dom完成从它的外观加载之前运行。 由于JavaScript被解释，因此它在浏览器读取时运行。 因为你在头部定义了代码，所以尚未加载正文及其内容; 所以选择器没有找到初始化datepicker的元素。 如果您不想使用document.ready功能，您还可以将脚本移动到body标记的末尾。 
 
    $(function(){
        $('.date_picker input').datepicker({
           format: "dd.mm.yyyy",
           todayBtn: "linked",
           language: "de"
        });
    });

Wrap the date picker initialize call in a document.ready. This code is running before the dom is finished loading from the look of it. Since JavaScript is interpreted it is run at the time it is read by the browser. Because you're defining the code in the head the body and its contents haven't been loaded yet; so the selector finds no elements to initialize datepicker. If you don't want to use document.ready functionality you could also move the script to the end of the body tag. 
 
    $(function(){
        $('.date_picker input').datepicker({
           format: "dd.mm.yyyy",
           todayBtn: "linked",
           language: "de"
        });
    });