Fix git info lookup to use correct dir where git exists

build.gradle

@@ -81,7 +81,7 @@ subprojects {
     nexus {
       String buildSnapshot = System.getProperty('build.snapshot', 'true')
       if (buildSnapshot == 'false') {
-        Repository repo = new RepositoryBuilder().findGitDir(new File('.')).build()
+        Repository repo = new RepositoryBuilder().findGitDir(project.rootDir).build()
         String shortHash = repo.resolve('HEAD')?.name?.substring(0,7)
         repositoryUrl = project.hasProperty('build.repository') ? project.property('build.repository') : "file://${System.getenv('HOME')}/elasticsearch-releases/${version}-${shortHash}/"
       }