refact: es search 결과 형식 변경

 import axios from 'axios';
 
 const esInstance = axios.create({
-  baseURL: process.env.API_ENDPOINT,
+  baseURL: process.env.REACT_APP_API_ENDPOINT,
   headers: {
     'Content-Type': 'application/json',
-    Authorization: `Bearer ${process.env.SEARCH_KEY}`,
+    Authorization: `Bearer ${process.env.REACT_APP_SEARCH_KEY}`,
   },
 });
 
-export const search = async searchWord => {
-  const res = await esInstance.post(
-    `/api/as/v1/engines/${process.env.APP_SEARCH_ENGINE_NAME}/search`,
-    {
-      query: searchWord,
-    }
-  );
+export const esApi = {
+  search: async searchWord => {
+    const res = await esInstance.post(
+      `/api/as/v1/engines/${process.env.REACT_APP_ENGINE_NAME}/search`,
+      {
+        query: searchWord,
+      }
+    );
 
-  console.log(res);
-  return res;
+    return res.data;
+  },
 };