travis: don't start default es service

.travis.yml

@@ -1,46 +1,45 b''
 language: python
 
 dist: xenial
 
 notifications:
   on_success: change
   on_failure: always
 
 matrix:
   include:
   - python: 3.5
     env: TOXENV=py35 ES_VERSION=6.6.2 ES_DOWNLOAD_URL=https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-${ES_VERSION}.tar.gz
   - python: 3.6
     env: TOXENV=py36 ES_VERSION=6.6.2 ES_DOWNLOAD_URL=https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-${ES_VERSION}.tar.gz
     addons:
       postgresql: "9.6"
   - python: 3.6
     env: TOXENV=py36 PGPORT=5432 ES_VERSION=6.6.2 ES_DOWNLOAD_URL=https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-${ES_VERSION}.tar.gz
     addons:
       postgresql: "10"
       apt:
         packages:
         - postgresql-10
         - postgresql-client-10
 
 install:
 - wget ${ES_DOWNLOAD_URL}
 - tar -xzf elasticsearch-oss-${ES_VERSION}.tar.gz
 - ./elasticsearch-oss-${ES_VERSION}/bin/elasticsearch &
 - travis_retry pip install -U setuptools pip tox
 
 script:
 - travis_retry tox
 
 services:
 - postgresql
-- elasticsearch
 - redis
 
 before_script:
   - psql -c "create user test with encrypted password 'test';" -U postgres
   - psql -c 'create database appenlight_test owner test;' -U postgres
 
 after_success:
 - pip install coveralls
 - coveralls