fix searching

packages/next/server/db.ts

@@ -58,9 +58,9 @@ export let db: Loki
 
 export let dbPost: Collection<IPost>
 
-export let idx: lunr.Index
+let idx: lunr.Index
 
-export async function initLunr () {
+export async function getLunr () {
   return idx || lunr.Index.load(require('../build/idx.json'))
 }