@nestjs/elasticsearch issue

app.module.ts

import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { ElasticsearchModule } from '@nestjs/elasticsearch';
import * as fs from 'fs';

console.log('-- cert', fs.readFileSync('../http_ca.crt'));
@Module({
  imports: [
    ElasticsearchModule.register({
      node: 'http://localhost:9200',
      auth: {
        username: 'elastic',
        password: 'the-password',
      },
      tls: {
        ca: fs.readFileSync('../http_ca.crt'),
        rejectUnauthorized: false,
      },
    }),
  ],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}

app.service

import { Injectable } from '@nestjs/common';
import { ElasticsearchService } from '@nestjs/elasticsearch';

@Injectable()
export class AppService {
  constructor(private readonly elasticsearchService: ElasticsearchService) {}

  async getHello(): Promise<any> {
    const result = await this.elasticsearchService.search();

    return result;
  }
}