String bwcBranch = this.gitExtension.getBwcBranch().get();
                final String refspec = providerFactory.systemProperty("bwc.refspec." + bwcBranch)
                    .orElse(providerFactory.systemProperty("tests.bwc.refspec." + bwcBranch))
                    .getOrElse(remote.get() + "/" + bwcBranch);

                String effectiveRefSpec = maybeAlignedRefSpec(logger, refspec);

     * we build from a bwc Version in a cloned repository
     */
    private static class DistributionProject {
        final String name;
        final File checkoutDir;
        final String projectPath;

        /**
         * can be removed once we don't build 7.10 anymore
         * from source for bwc tests.
         */
        @Deprecated

/**
 * An internal elasticsearch build plugin that registers additional
 * distribution resolution strategies to the 'elasticsearch.download-distribution' plugin
 * to resolve distributions from a local snapshot or a locally built bwc snapshot.
 */
public class InternalDistributionDownloadPlugin implements InternalPlugin {

    @Override
    public void apply(Project project) {
        // this is needed for isInternal

  source $(dirname "${SCRIPT}")/java-versions-aarch64.properties
  export JAVA15_HOME="${HOME}"/.java/jdk15
else
  source $(dirname "${SCRIPT}")/java-versions.properties
  ## We are caching BWC versions too, need these so we can build those
  export JAVA8_HOME="${HOME}"/.java/java8
  export JAVA11_HOME="${HOME}"/.java/java11
  export JAVA12_HOME="${HOME}"/.java/openjdk12
  export JAVA13_HOME="${HOME}"/.java/openjdk13

        String test = "10_basic.yml"
        //add the compatible test and api files, these are the prior version's normal yaml rest tests
        file("distribution/bwc/minor/checkoutDir/rest-api-spec/src/main/resources/rest-api-spec/api/" + api) << ""
        file("distribution/bwc/minor/checkoutDir/src/yamlRestTest/resources/rest-api-spec/test/" + test) << ""

        when:

        packagesProject = ProjectBuilder.builder().withParent(distributionProject).withName("packages").build();
        bwcProject = ProjectBuilder.builder().withParent(distributionProject).withName("bwc").build();
        Project project = ProjectBuilder.builder().withParent(rootProject).build();
        if (bwcVersions != null) {
            project.getExtensions().getExtraProperties().set("bwcVersions", bwcVersions);

                );
            }
        }
    }

    public void testLocalBwcArchives() {
        for (Platform platform : Platform.values()) {
            // note: no non bundled jdk for bwc
            String configName = projectName(platform.toString(), true);
            configName += (platform == Platform.WINDOWS ? "-zip" : "-tar");

              kill-phase-on: NEVER
              current-parameters: true
              git-revision: true
            - name: elastic+elasticsearch+%BRANCH%+intake+multijob+bwc
              kill-phase-on: NEVER
              current-parameters: true
              git-revision: true
            - name: elastic+elasticsearch+%BRANCH%+intake+multijob+rest-compat
              kill-phase-on: NEVER

        if (System.getProperty("repos.mavenLocal") != null) {
            // with -Drepos.mavenLocal=true we can force checking the local .m2 repo which is
            // useful for development ie. bwc tests where we install stuff in the local repository
            // such that we don't have to pass hardcoded files to gradle
            repos.mavenLocal();
        }
        repos.mavenCentral();

import java.util.stream.Stream;

import static java.util.Collections.emptyList;
import static java.util.Collections.unmodifiableList;

/**
 * A container for elasticsearch supported version information used in BWC testing.
 * <p>
 * Parse the Java source file containing the versions declarations and use the known rules to figure out which are all
 * the version the current one is wire and index compatible with.