Passing db_name param to the describeCollection() (#373)

* Fix "Cannot read properties of undefined reading nq" because of the database is not passed to `describeCollection` function

* Delete package-lock.json

* Delete yarn.lock

* Revert "Delete yarn.lock"

This reverts commit 9c4d8e5.

* Remove lock files

This reverts commit 8315115.

* Revert "Remove lock files"

This reverts commit 4f23775.

* Remove lock files

milvus/grpc/Data.ts

@@ -66,6 +66,7 @@ import {
   getSparseDim,
   f32ArrayToBinaryBytes,
   NO_LIMIT,
+  DescribeCollectionReq,
 } from '../';
 import { Collection } from './Collection';
 
@@ -446,11 +447,19 @@ export class Data extends Collection {
   async search(
     data: SearchReq | SearchSimpleReq | HybridSearchReq
   ): Promise<SearchResults> {
-    // get collection info
-    const collectionInfo = await this.describeCollection({
+    // default collection request
+    const describeCollectionRequest = {
       collection_name: data.collection_name,
       cache: true,
-    });
+    } as DescribeCollectionReq;
+
+    // get collection info
+    if (data.db_name) {
+      // if the request has `db_name` pass it to the request.
+      describeCollectionRequest.db_name = data.db_name;
+    }
+
+    const collectionInfo = await this.describeCollection(describeCollectionRequest);
 
     // build search params
     const { request, nq, round_decimal, isHybridSearch } = buildSearchRequest(