Fixed #1050. Now its possible to clear the search in the documentation

Documentation/Books/Users/localtheme/assets/style.css

@@ -2917,3 +2917,22 @@ background-color: rgba(240,240,0,0.4);
 .book .book-body .page-wrapper .page-inner section.normal .deprecated pre{
 background-color: rgba(240,240,0,0.4);
 }
+
+#clear-search {
+    display: inline;
+    position: absolute;
+    top: 12px;
+    right: 9px;
+    font-size: 18pt;
+    line-height: 18pt;
+    color: #364149; // needs to be updated on theme change
+}
+
+#clear-search:hover {
+    color: #008cff; // needs to be updated on theme change
+    text-decoration: none;
+}
+
+.book .book-summary .book-search input{
+  padding-right: 20px !important;
+}

Documentation/Books/Users/localtheme/templates/includes/book/summary.html

@@ -34,6 +34,7 @@
 
 <div class="book-summary">
     <div class="book-search">
+        <a id="clear-search" href="#">&times;</a>
         <input type="text" placeholder="Type to search" class="form-control" />
     </div>
     <ul class="summary">
@@ -88,3 +89,9 @@ $(function(){
   });
 });
 </script>
+<script type="text/javascript">
+$('#clear-search').on('click', function(event){
+    event.preventDefault();
+    $('.book-search input').val("").trigger("keyup");
+});
+</script>