Add React module and remove function of closing serch WS

Author: chunqiuyiyu

app/components/Search/search.jsx

@@ -1,4 +1,4 @@
-import { Component } from "react";
+import React, { Component } from "react";
 import { observer } from 'mobx-react'
 import subscribeToSearch from 'commons/Search/subscribeToSearch'
 import state from 'commons/Search/state'
@@ -78,12 +78,6 @@ class SearchPanel extends Component {
       subscribeToSearch()
     }
 
-    componentWillUnmount() {
-      if (config.searchSocketConnected) {
-        api.searchWorkspaceDown()
-      }
-    }
-
     onKeyDown = (e) => {
         if (e.keyCode === 13) {
           this.searchTxt()