diff --git a/.travis.yml b/.travis.yml
index 1d5b6070..d95df8a0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,11 +16,11 @@ install:
   - ./elasticsearch-${ES_VERSION}/bin/elasticsearch -d
 before_script:
   - composer require --no-update symfony/framework-bundle:${SYMFONY}
-  - composer config -g github-oauth.github.com $GITHUB_COMPOSER_AUTH
+  -  if [[ $TRAVIS_SECURE_ENV_VARS = "true" ]]; then composer config -g github-oauth.github.com $GITHUB_COMPOSER_AUTH; fi
   - composer install --no-interaction --prefer-dist
 script:
   - wget -q --waitretry=1 --retry-connrefused -T 10 -O - http://127.0.0.1:9200
   - vendor/bin/phpunit --coverage-clover=coverage.clover
   - vendor/bin/phpcs -p --standard=PSR2 --ignore=vendor/,Tests/app/,var/cache ./
 after_script:
-  - travis_retry php vendor/bin/coveralls
\ No newline at end of file
+  - travis_retry php vendor/bin/coveralls
diff --git a/DependencyInjection/Compiler/MappingPass.php b/DependencyInjection/Compiler/MappingPass.php
index ad55c62a..3f696a9e 100644
--- a/DependencyInjection/Compiler/MappingPass.php
+++ b/DependencyInjection/Compiler/MappingPass.php
@@ -62,10 +62,16 @@ private function handleDirectoryMapping(ContainerBuilder $container, string $dir
 
         foreach ($this->getNamespaces($dir) as $namespace) {
             $class = new \ReflectionClass($namespace);
+
+            if (isset($indexesOverride[$namespace]['alias']) && $indexesOverride[$namespace]['alias']) {
+                $indexAlias = $indexesOverride[$namespace]['alias'];
+            } else {
+                $indexAlias = $parser->getIndexAliasName($class);
+            }
+
             /** @var Index $document */
             $document = $parser->getIndexAnnotation($class);
             $indexMapping = $parser->getIndexMetadata($class);
-            $indexAlias = $parser->getIndexAliasName($class);
             $indexMetadata = $parser->getIndexMetadata($class);
 
             if (!empty($indexMapping)) {
diff --git a/Tests/Functional/Service/IndexServiceTest.php b/Tests/Functional/Service/IndexServiceTest.php
index ebb2eb2a..6eb6dc00 100644
--- a/Tests/Functional/Service/IndexServiceTest.php
+++ b/Tests/Functional/Service/IndexServiceTest.php
@@ -45,7 +45,8 @@ public function indexNameDataProvider()
     {
         return [
           [ DummyDocument::class, DummyDocument::INDEX_NAME ],
-          [ DummyDocumentInTheEntityDirectory::class, DummyDocumentInTheEntityDirectory::INDEX_NAME ],
+          // this alias is overriden in configuration
+          [ DummyDocumentInTheEntityDirectory::class, 'field-data-index' ],
         ];
     }