message: use admin db
diff: @@ -23,6 +23,7 @@ import {
  } from '@mongosh/service-provider-core';
  import { AggregationCursor } from './index';
  import { MongoshInvalidInputError, MongoshUnimplementedError } from '@mongosh/errors';
  +const ADMIN_DB = 'admin';
  @shellApiClassDefault
  @hasAsyncChild
  @@ -148,7 +149,7 @@ export default class Database extends ShellApiClass {
  @serverVersions(['3.4.0', ServerVersions.latest])
  adminCommand(cmd: any): Promise<any> {
  this._emitDatabaseApiCall( 'adminCommand', { cmd });
  - return this._mongo._serviceProvider.runCommand('admin', cmd);
  + return this._mongo._serviceProvider.runCommand(ADMIN_DB, cmd);
  }
  /**
  @@ -565,7 +566,7 @@ export default class Database extends ShellApiClass {
  async currentOp(opts: any = {}): Promise<any> {
  this._emitDatabaseApiCall('currentOp', { opts: opts });
  return await this._mongo._serviceProvider.runCommand(
  - this._name,
  + ADMIN_DB,
  {
  currentOp: 1,
  ...opts
  @@ -578,7 +579,7 @@ export default class Database extends ShellApiClass {
  checkUndefinedUpdate(opId);
  this._emitDatabaseApiCall('killOp', { opId });
  return await this._mongo._serviceProvider.runCommand(
  - this._name,
  + ADMIN_DB,
  {
  killOp: 1,
  op: opId
  @@ -590,7 +591,7 @@ export default class Database extends ShellApiClass {
  async shutdownServer(opts: any = {}): Promise<any> {
  this._emitDatabaseApiCall('shutdownServer', { opts: opts });
  return await this._mongo._serviceProvider.runCommand(
  - this._name,
  + ADMIN_DB,
  {
  shutdown: 1,
  ...opts
  @@ -602,7 +603,7 @@ export default class Database extends ShellApiClass {
  async fsyncLock(): Promise<any> {
  this._emitDatabaseApiCall('fsyncLock', {});
  return await this._mongo._serviceProvider.runCommand(
  - this._name,
  + ADMIN_DB,
  {
  fsync: 1,
  lock: true
  @@ -614,7 +615,7 @@ export default class Database extends ShellApiClass {
  async fsyncUnlock(): Promise<any> {
  this._emitDatabaseApiCall('fsyncUnlock', {});
  return await this._mongo._serviceProvider.runCommand(
  - this._name,
  + ADMIN_DB,
  {
  fsyncUnlock: 1
  }
  