feat: compatible elasticsearch version requires compatible java too

Author: adithya.sathu

.travis.yml

@@ -5,13 +5,13 @@ language: node_js
 node_js:
   - '10'
 
-addons:
-  apt:
-    packages:
-      - oracle-java11-installer
+jdk: oraclejdk11
 
 before_install:
-  - curl -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.6.2-amd64.deb && sudo dpkg -i --force-confnew elasticsearch-7.6.2-amd64.deb && sudo service elasticsearch restart
+  - curl -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.6.2-amd64.deb && sudo dpkg -i --force-confnew elasticsearch-7.6.2-amd64.deb && sudo chown -R elasticsearch:elasticsearch /etc/default/elasticsearch && sudo service elasticsearch restart
+
+before_script:
+  - sleep 10
 
 services:
   - mongodb