TASK: Update elasticsearch even further

Use latest stable 6.x releases, for elasticsearch and used library.

.travis.yml

@@ -5,7 +5,7 @@ addons:
     packages:
       - oracle-java8-set-default
 before_install:
-  - curl -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.4.1.deb && sudo dpkg -i --force-confnew elasticsearch-6.4.1.deb && sudo service elasticsearch restart
+  - curl -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.5.4.deb && sudo dpkg -i --force-confnew elasticsearch-6.5.4.deb && sudo service elasticsearch restart
   - mysql -u root -e 'GRANT ALL ON `typo3_ci_ft%`.* TO travis@127.0.0.1;'
 
 language: php

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": ">=7.0.0",
         "typo3/cms": ">= 8.7.0 < 9.0.0",
-        "ruflin/elastica": "^6.0.2"
+        "ruflin/elastica": "^6.1.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~6.4.4",