# Migration Guide

This guide provides comprehensive instructions for migrating from other enterprise search systems to Fess. Fess offers robust compatibility layers, import tools, and APIs to facilitate smooth transitions from various search platforms.

## Table of Contents

- [Supported Migration Sources](#supported-migration-sources)
- [Pre-Migration Planning](#pre-migration-planning)
- [Migration Methods](#migration-methods)

			var rebalanced, expired int
			for _, version := range fivs.Versions {
				stopFn := globalRebalanceMetrics.log(rebalanceMetricRebalanceObject, poolIdx, bucket, version.Name, version.VersionID)

				// Skip transitioned objects for now. TBD
				if version.IsRemote() {
					stopFn(version.Size, errors.New("ILM Tiered version will be skipped for now"))
					continue
				}

// its contents and false otherwise.
func (j xlMetaV2Object) UsesDataDir() bool {
	// Skip if this version is not transitioned, i.e it uses its data directory.
	if !bytes.Equal(j.MetaSys[metaTierStatus], []byte(lifecycle.TransitionComplete)) {
		return true
	}

	// Check if this transitioned object has been restored on disk.
	return isRestoredObjectOnDisk(j.MetaUser)
}

			initBackgroundExpiry(GlobalContext, newObject)
		})

		bootstrapTrace("globalTransitionState.Init", func() {
			globalTransitionState.Init(newObject)
		})

		go func() {
			// Initialize transition tier configuration manager
			bootstrapTrace("globalTierConfigMgr.Init", func() {
				if err := globalTierConfigMgr.Init(GlobalContext, newObject); err != nil {
					bootLogIf(GlobalContext, err)
				}
			})

		if _, err = disk.RenameData(ctx, minioMetaTmpBucket, tmpID, partsMetadata[i], bucket, object, RenameOptions{}); err != nil {
			return result, err
		}

		// - Remove any remaining parts from outdated disks from before transition.
		if partsMetadata[i].IsRemote() {
			rmDataDir := partsMetadata[i].DataDir
			disk.Delete(ctx, bucket, pathJoin(encodeDirObject(object), rmDataDir), DeleteOptions{
				Immediate: true,
				Recursive: true,
			})

");if(!e||"#"===e){var n=t.getAttribute("href");e=n&&"#"!==n?n.trim():""}try{return document.querySelector(e)?e:null}catch(t){return null}},getTransitionDurationFromElement:function(t){if(!t)return 0;var e=o.default(t).css("transition-duration"),n=o.default(t).css("transition-delay"),i=parseFloat(e),a=parseFloat(n);return i||a?(e=e.split(",")[0],n=n.split(",")[0],1e3*(parseFloat(e)+parseFloat(n))):0},reflow:function(t){return t.offsetHeight},triggerTransitionEnd:function(t){o.default(t).trigger(...

	if err != nil {
		return nil, 0, 0, err
	}

	// if object is encrypted and it is a restore request or if NoDecryption
	// was requested, fetch content without decrypting.
	if opts.Transition.RestoreRequest != nil || opts.NoDecryption {
		isEncrypted = false
		isCompressed = false
	}

	// Calculate range to read (different for encrypted/compressed objects)
	switch {
	case isCompressed:

     *
     * * [http/1.1][rfc_2616]
     * * [h2][rfc_7540]
     * * [h2 with prior knowledge(cleartext only)][rfc_7540_34]
     *
     * **This is an evolving set.** Future releases include support for transitional
     * protocols. The http/1.1 transport will never be dropped.
     *
     * If multiple protocols are specified, [ALPN][alpn] will be used to negotiate a transport.

			}
			if oi.VersionID != "" && sz == actualSz {
				sizeS.versions++
			}
			sizeS.totalSize += sz

			// Skip tier accounting if object version is a delete-marker or a free-version
			// tracking deleted transitioned objects
			switch {
			case oi.DeleteMarker, oi.TransitionedObject.FreeVersion:
				return
			}
			tier := oi.StorageClass
			if tier == "" {
				tier = storageclass.STANDARD // no SC means "STANDARD"

			traceFn(ILMExpiry, nil, nil)
			return false
		}
		// Assume it is still there.
		err := fmt.Errorf("DeleteObject(%s, %s): %w", obj.Bucket, obj.Name, err)
		ilmLogOnceIf(ctx, err, "non-transition-expiry"+obj.Name)
		traceFn(ILMExpiry, nil, err)
		return false
	}
	if dobj.Name == "" {
		dobj = obj
	}

	tags := newLifecycleAuditEvent(src, lcEvent).Tags()