core&elastic: fix search by id

packages/elastic/index.ts

@@ -60,6 +60,7 @@ export default class ElasticSearchService extends Service {
                 pdoc = await ProblemModel.get(domainId, +q.substring(1), ProblemModel.PROJECTION_LIST);
                 if (pdoc) hits.unshift(`${pdoc.domainId}/${pdoc.docId}`);
             }
+            if (hits.length > size) hits.pop();
         }
         return {
             countRelation: typeof res.hits.total === 'number' ? 'eq' : res.hits.total.relation,

packages/hydrooj/src/handler/problem.ts

@@ -67,6 +67,7 @@ const defaultSearch = async (domainId: string, q: string, options?: ProblemSearc
             pdoc = await problem.get(domainId, +q.substring(1), projection);
             if (pdoc) pdocs.unshift(pdoc);
         }
+        if (pdocs.length > (options.limit || system.get('pagination.problem'))) pdocs.pop();
     }
     return {
         hits: Array.from(new Set(pdocs.map((i) => `${i.domainId}/${i.docId}`))),