mongosh ヘルプ

Database Class:
  getMongo                      Returns the current database connection
  getName                       Returns the name of the DB
  getCollectionNames            Returns an array containing the names of all collections in the current database.
  getCollectionInfos            Returns an array of documents with collection information, i.e. collection name and options, for the current database.
  runCommand                    Runs an arbitrary command on the database.
  adminCommand                  Runs an arbitrary command against the admin database.
  ...

  db.adminCommand({ serverStatus: 1 }):
  Runs an arbitrary command against the admin database.
  For more information on usage: https://www.mongodb.com/ja-jp/docs/manual/reference/method/db.adminCommand

[Function: adminCommand] AsyncFunction {
  apiVersions: [ 1, Infinity ],
  serverVersions: [ '3.4.0', '999.999.999' ],
  returnsPromise: true,
  topologies: [ 'ReplSet', 'Sharded', 'LoadBalanced', 'Standalone' ],
  returnType: { type: 'unknown', attributes: {} },
  deprecated: false,
  platforms: [ 0, 1, 2 ],
  isDirectShellCommand: false,
  acceptsRawInput: false,
  shellCommandCompleter: undefined,
  help: [Function (anonymous)] Help
}

managementFeedback          [view]
survey
weather                     [time-series]
system.buckets.weather
system.views

Collection Class:
  aggregate          Calculates aggregate values for the data in a collection or a view.
  bulkWrite          Performs multiple write operations with controls for order of execution.
  count              Returns the count of documents that would match a find() query for the collection or view.
  countDocuments     Returns the count of documents that match the query for a collection or view.
  deleteMany         Removes all documents that match the filter from a collection.
  deleteOne          Removes a single document from a collection.
  ...

db.collection.insertOne(document, options):
Inserts a document into a collection.
For more information on usage: https://www.mongodb.com/ja-jp/docs/manual/reference/method/db.collection.insertOne