python elasticsearch docker from within other container

version: '3'

services:
  elasticsearch:
    build: elasticsearch/
    ports: 
      - 9200:9200
    networks:
      - deploy_network
    container_name: elasticsearch

  indexer:
    build: indexer/
    depends_on:
      - elasticsearch
    networks:
      - deploy_network
    container_name: indexer

networks:
  deploy_network:
    driver: bridge