Before migration:

1. Export current search configurations
2. Backup existing indices and data
3. Document custom integrations and API endpoints
4. Save user access control settings

---

## Migration Methods

### Google Search Appliance (GSA) / Google Mini

Fess provides comprehensive GSA migration support through configuration import and API compatibility.

#### Configuration Import

    /**
     * Indicates that the NTLM2 signing and sealing scheme should be used
     * for protecting authenticated communications. This refers to a
     * particular session security scheme, and is not related to the use
     * of NTLMv2 authentication.
     */
    int NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY = 0x00080000;

    /**
     * ?? According to spec this is a reserved bit and must be set to zero
     */

 *
 * <p>The methods returning collections or maps always return views of the underlying table.
 * Updating the table can change the contents of those collections, and updating the collections
 * will change the table.
 *
 * <p>All methods that modify the table are optional, and the views returned by the table may or may
 * not be modifiable. When modification isn't supported, those methods will throw an {@link
 * UnsupportedOperationException}.
 *

     *
     * @param messageCode
     *            the message code
     * @param args
     *            the message arguments
     */
    public FileAccessException(final String messageCode, final Object[] args) {
        super(messageCode, args);
    }

    /**
     * Creates a new {@link FileAccessException} with the specified message code and cause.
     *

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.api.spi;

import org.apache.maven.api.annotations.Consumer;
import org.apache.maven.api.annotations.Experimental;

/**
 * Marker interface to indicate services that can be provided by plugins and extensions.
 * <p>

    /*
     * We adjust approxLog10 and approxPow until they're equal to floor(log10(x)) and
     * 10^floor(log10(x)).
     */

    if (approxCmp > 0) {
      /*
       * The code is written so that even completely incorrect approximations will still yield the
       * correct answer eventually, but in practice this branch should almost never be entered, and
       * even then the loop should not run more than once.

     * their caseless domain and username fields are equal and either both hashes are external and they are equal or
     * both internally supplied passwords are equal. If one {@code NtlmPasswordAuthentication} object has external
     * hashes (meaning negotiated via NTLM HTTP Authentication) and the other does not they will not be equal. This is

    <p>A Toolchain is a preconfigured object that Maven plugins can use for tool configuration retrieval (location and other information).
    <p>The <a href="/plugins/maven-toolchains-plugin/">toolchains-plugin</a> can read available toolchains on the user's computer
    and match them against the toolchain requirements of the project (as configured in {@code pom.xml}):

     *
     * @param statusCode The HTTP status code
     * @param message The detail message
     */
    public WebApiException(final int statusCode, final String message) {
        super(message);
        this.statusCode = statusCode;
    }

    /**
     * Constructs a WebApiException with the specified status code and exception.
     *

   * <p><b>Warning:</b> On a file system that supports symbolic links, it is possible for an
   * insecure recursive delete to delete files and directories that are <i>outside</i> the directory
   * being deleted. This can happen if, after checking that a file is a directory (and not a
   * symbolic link), that directory is deleted and replaced by a symbolic link to an outside
   * directory before the call that opens the directory to read its entries. File systems that