Method explain

src/cursor/aggregation_cursor.ts:105–121

(
    verbosity?: ExplainVerbosityLike | ExplainCommandOptions | { timeoutMS?: number },
    options?: { timeoutMS?: number }
  )

    options: { timeoutMS?: number }
  ): Promise<Document>;
  async explain(
    verbosity?: ExplainVerbosityLike | ExplainCommandOptions | { timeoutMS?: number },
    options?: { timeoutMS?: number }
  ): Promise<Document> {
    const { explain, timeout } = this.resolveExplainTimeoutOptions(verbosity, options);
    return (
      await executeOperation(
        this.client,
        new AggregateOperation(this.namespace, this.pipeline, {
          ...this.aggregateOptions, // NOTE: order matters here, we may need to refine this
          ...this.cursorOptions,
          ...timeout,
          explain: explain ?? true
        })
      )
    ).shift(this.deserializationOptions);
  }

  /** Add a stage to the aggregation pipeline
   * @example