elasticsearch/distribution/docker/oss-docker-build-context/build.gradle

apply plugin: 'base'

task buildOssDockerBuildContext(type: Tar) {
  extension = 'tar.gz'
  compression = Compression.GZIP
  archiveClassifier = "docker-build-context"
  archiveBaseName = "elasticsearch-oss"
  with dockerBuildContext(true, false)
}

assemble.dependsOn buildOssDockerBuildContext