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

                String effectiveRefSpec = maybeAlignedRefSpec(logger, refspec);

                ? new File(projectArtifact.expandedDistDir, "elasticsearch-" + bwcVersion.get() + "-SNAPSHOT")
                : projectArtifact.distFile;
            c.getInputs().file(new File(project.getBuildDir(), "refspec"));
            if (useNativeExpanded) {
                c.getOutputs().dir(expectedOutputFile);
            } else {
                c.getOutputs().files(expectedOutputFile);
            }

pulling the release branch from GitHub. You do so using the `bwc.remote` and `bwc.refspec.BRANCH` system properties:

-------------------------------------------------
./gradlew check -Dbwc.remote=${remote} -Dbwc.refspec.5.x=index_req_bwc_5.x
-------------------------------------------------

The branch needs to be available on the remote that the BWC makes of the

        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(KEY_DERIVATION_ALGORITHM);
        KeySpec keySpec = new PBEKeySpec(password, salt, PBKDF2_ITERATIONS, KEY_SIZE);
        SecretKey tempKey = keyFactory.generateSecret(keySpec);
        return new SecretKeySpec(tempKey.getEncoded(), KEY_ALGORITHM);
    }

    /**
     * Convert char array to byte array (UTF-8)
     */

    for sale, have made, import, and otherwise transfer either its
    Contributions or its Contributor Version.

2.2. Effective Date

The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.

2.3. Limitations on Grant Scope

        thread.start();
        thread.join(2000);

        String output = thread.getOutput();
        String[] lines = output.split("\n");

        assertTrue("Buffer should respect max size", lines.length <= InputStreamThread.MAX_BUFFER_SIZE + 1);
    }

    @Test
    public void test_getOutput_emptyStream() throws InterruptedException {

            final SecretKeySpec keySpec = new SecretKeySpec(keyCopy, "AES");
            final Cipher cipher = Cipher.getInstance(transformation);
            final GCMParameterSpec gcmSpec = new GCMParameterSpec(getAuthTagLength() * 8, nonce);

            cipher.init(encrypt ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE, keySpec, gcmSpec);
            return cipher;
        } finally {

        // Use HMAC-SHA256 for channel binding
        Mac mac = Mac.getInstance("HmacSHA256");
        SecretKeySpec keySpec = new SecretKeySpec(sessionKey, "HmacSHA256");
        mac.init(keySpec);
        
        // Include channel-specific data
        mac.update(channel.getLocalInterface().getAddress().getAddress());

	return err
}

// DeadlineWriter deadline writer with timeout
type DeadlineWriter struct {
	io.WriteCloser
	timeout time.Duration
	err     error
}

// NewDeadlineWriter wraps a writer to make it respect given deadline
// value per Write(). If there is a blocking write, the returned Writer
// will return whenever the timer hits (the return values are n=0
// and err=context.DeadlineExceeded.)

            secondary_limit_wait_time = interval - time_since_last_request

        final_wait_time = ceil(max(primary_limit_wait_time, secondary_limit_wait_time))
        logging.info(f"Sleeping for {final_wait_time} seconds to respect rate limit")
        time.sleep(max(final_wait_time, 1))

        self.last_request_start_time = datetime.now(tz=timezone.utc)
        return self

    def __exit__(self, exc_type, exc_val, exc_tb) -> None: