Short answer: Treat identity and permission metadata as migration data, not as a setting you add after launch. Map users, groups, nested groups and service principals; copy ACL or RBAC fields with every document; enforce authorization in the query pipeline; and define a refresh trigger for every source and permission scope. Run the old and new systems in parallel against representative users and documents, then cut over only after visibility, revocation and freshness tests pass.
Why permission metadata must move with the index
An enterprise search index is an authorization system as well as a text database. A document can be perfectly crawled and ranked yet still be unsafe if its access-control metadata is missing, stale or mapped to the wrong identity. Replacing the search engine therefore requires migrating three related data sets together:
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- Content: the document body, title, source URL, key, timestamps and deletion state.
- Identity: the users, groups, nested groups and service principals that appear in source permissions.
- Authorization state: ACL, RBAC, role, scope and inheritance information used to decide whether a caller may see a result.
Query-time security trimming is only as current as the permission metadata synchronized into the index. Azure AI Search, for example, compares Microsoft Entra claims presented by the caller with ACL or RBAC metadata stored alongside each indexed document and returns only documents whose synchronized permission metadata grants access. A query-time control cannot correct an ACL that was never ingested or has not been refreshed after a source change.
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1. Inventory the existing search system before building the replacement
Create a source-by-source inventory and preserve it as a migration artifact. The objective is to discover where authorization is evaluated today and which events can make an indexed permission stale.
Record every content and identity dependency
- Connector or ingestion method for each repository.
- Identity provider and the identifier format used in source ACLs.
- Direct users, groups, nested groups, service principals and group-expansion rules.
- Whether permissions are inherited from a site, library, list, folder, workspace or parent object.
- Document key, source URL, modification timestamp and deleted-document signal.
- Whether authorization is evaluated at crawl time, index time, query time or in the application.
- Indexer, webhook or push schedule, including any event-driven refresh path.
- Existing resync, reset, replay and rollback procedures.
Capture inheritance rather than flattening it blindly
Record the object at which a permission is defined and the objects that inherit it. A child item may have no local ACL of its own, yet a change at a parent folder or library can alter visibility for thousands of children. Your replacement must either materialize the effective permissions for each document or retain enough relationship data to recompute them reliably during a refresh.
Document current failure behavior
Find out what happens when the identity directory, group-expansion service or permission API is unavailable. A system that returns a partial result set when authorization evaluation fails is difficult to operate safely. Azure AI Search documents a fail-closed behavior: if ACL evaluation fails, the service returns an HTTP 5xx rather than a partially filtered result set. Treat that behavior, or an equivalent explicit failure, as an acceptance criterion for the replacement.
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Before mapping fields, define the minimum authorization record that must accompany a document. This contract is the interface between connectors, indexers, identity synchronization and query-time enforcement.
| Field or concept | Purpose | Required decision |
|---|---|---|
| Canonical document identifier | Joins updates, deletes, permission changes and test results to the same document. | Choose a stable key that does not change when a file is renamed or moved. |
| Allowed users and groups | Identifies principals that may read the document. | Specify identifier format and whether nested groups are expanded before indexing. |
| Role or scope claims | Represents RBAC-style access beyond a simple allow list. | Define accepted claim names and their relationship to caller claims. |
| Source URL and repository ID | Lets the result link back to the authoritative object and supports incident investigation. | Keep the URL and source identity stable across reindexing. |
| Content timestamp | Shows when the searchable content changed. | Use the source’s authoritative modification time and record its time zone or UTC conversion. |
| Permission timestamp | Shows when authorization metadata was last confirmed. | Update it whenever ACL or RBAC state is reingested, even if the text is unchanged. |
| Deletion state | Prevents deleted or withdrawn content from remaining searchable. | Define a tombstone, delete event or reconciliation rule. |
| Inheritance context | Explains which parent change can affect the document. | Store parent identifiers or an equivalent refresh scope when permissions are inherited. |
The exact field names are implementation choices; the semantics are not. A document update that changes text but drops its ACL is not a valid update. Likewise, an ACL update that cannot be associated with the canonical document key cannot safely be applied.
3. Map identities before indexing documents
Permission strings are useful only when they resolve to the identities presented at query time. Synchronize the directory first, then validate the mapping with real tokens or claims.
Use one canonical identity representation
Choose whether the target stores immutable directory object IDs, user principal names, group IDs or another provider-specific identifier. Prefer an identifier that remains stable when a person changes their display name or email address. Store the provider and tenant context if the same identifier could exist in more than one directory.
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Resolve nested groups deliberately
Determine whether the source connector supplies nested membership, whether the target expands groups during indexing, or whether query-time evaluation expands them. Test a user who receives access only through a second-level group. A migration that handles direct membership but ignores nesting will produce both false denials and, if groups are misinterpreted, false grants.
Account for hybrid SharePoint identities
In hybrid SharePoint environments, directory synchronization maps on-premises ACL identities to Microsoft Entra identities so security trimming works against the cloud index. Verify that the identifier in an on-premises permission entry resolves to the same Microsoft Entra identity included in the caller’s token. Test ordinary users, groups and recently changed memberships before indexing the full corpus.
Validate service principals and non-human callers
Indexers, automation jobs and API clients may use service principals with different claims from an interactive user. Include them in the identity inventory and ensure that administrative or ingestion credentials cannot accidentally become document readers in the search API.
4. Build a permission-refresh matrix
Every source and permission scope needs one documented trigger, one expected latency and one owner. “The index refreshes periodically” is not sufficient: the correct action differs between a unique item permission and an inherited parent permission.
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| Source or change | Refresh action | What happens if it is omitted |
|---|---|---|
| SharePoint item with unique permissions | Complete a successful indexer run that detects the item change. | The item can retain old visibility until that run finishes. |
| SharePoint site, library, list or folder with inherited permissions | Run /resync with options: ["permissions"], or use a targeted /resetdocs operation. |
Child items can retain stale ACL metadata even though the parent permission changed. |
| ADLS Gen2 ACL change | Resynchronize the indexer or data source. | Query-time trimming continues to use the previous ACL. |
| Custom push ingestion | Reingest every affected document with its updated permission metadata. | The index continues making authorization decisions from outdated data. |
Microsoft’s guidance is explicit that changing permissions without triggering an update mechanism leaves stale ACL or RBAC data in the search index. Record the trigger in the source owner’s change-management procedure, not only in the search team’s runbook.
Set latency by risk and change rate
No universal freshness SLA or error-rate target is published for all repositories. Set an approved maximum delay for grants and revocations based on the sensitivity of the source and how often permissions change. A highly confidential project may require event-driven updates and an emergency resync path, while a low-risk archive may tolerate a scheduled run. Whatever threshold you choose, test both directions: newly granted access must appear and revoked access must disappear within the same stated window.
5. Choose and verify the enforcement architecture
Native query-time trimming
With native enforcement, the search service receives caller claims and compares them with indexed ACL or RBAC metadata before returning results. This keeps the authorization decision close to retrieval and makes it harder for an application bug to leak a result. It still depends on accurate identity synchronization and timely permission refreshes.
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Security filters in the query pipeline
If the target does not provide a native ACL feature, an equivalent security-filter design must be specified precisely: which fields contain allowed principals, how groups are expanded, how filters are composed with user queries, and how failures are handled. Do not accept a design that trims only the first page of results, ignores facets or suggestions, or applies the filter after snippets and highlights have already been generated.
Application-side trimming as a last resort
Application-side filtering can be necessary for legacy systems, but it should be treated as a compensating control with additional tests and monitoring. Ensure that every endpoint—including autocomplete, result counts, exports, cached responses and analytics—applies the same authorization logic. A service that enforces permissions only on the main results endpoint is incomplete.
6. Stage the migration with a controlled comparison
Start with a small dataset or a single index. Elastic’s migration guidance recommends this staged approach because it limits the blast radius and gives the team a controlled comparison point. Expand only after the security and freshness checks pass.
Prepare representative test data
- Documents with direct user permissions.
- Documents accessible through one-level and nested groups.
- Documents inheriting access from a site, library, list or folder.
- Documents with unique child permissions that override a parent.
- Recently created, moved, renamed and deleted documents.
- Documents whose permissions are granted and revoked during the test window.
Run the same queries as controlled personas
Use an ordinary employee, a restricted project member, a manager, a recently removed user, a newly added user and a user affected by an inherited-permission change. Use identical query text, filters and pagination against both systems. Capture the document key, source link, ranking position, visibility decision and timestamp of the latest ACL refresh.
Compare more than the result count
| Comparison | Pass condition |
|---|---|
| Authorized documents | Every document visible in the old system and permitted for the persona is visible in the target, subject to an explained ranking difference. |
| Unauthorized documents | No document, title, snippet, facet, suggestion or source link outside the persona’s permissions appears. |
| Newly granted access | The document appears within the approved grant-propagation latency. |
| Revoked access | The document disappears within the approved revocation latency. |
| Deleted or moved content | Deleted objects are absent and moved objects resolve to the intended source URL without duplicate stale copies. |
| Identity or API outage | The service fails closed with an observable error, rather than returning a partially filtered response. |
Keep the old system available during the comparison window. Store query-visibility diffs, ACL refresh timestamps, indexing lag and errors so that an unexpected result can be traced to content, identity, permissions or ranking rather than guessed at after cutover.
7. Handle SharePoint permission changes correctly
Unique item permissions
A SharePoint item with unique permissions can be updated by a successful indexer run. The run must actually complete and process the changed item; a scheduled job that is disabled, failing or skipping the object does not satisfy the refresh requirement. Monitor the run result and the item’s permission timestamp.
Inherited site, library, list and folder permissions
Changing an inherited permission at a parent scope requires an explicit permissions resynchronization or a targeted document reset. Use /resync with options: ["permissions"], or target affected documents with /resetdocs. Without that operation, child documents can retain the old ACL even though their source now shows a different effective permission.
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Test inheritance breaks and restorations
Include a child that inherits access, a child with a unique override and a child whose inheritance is later restored. Verify that the parent change affects only the documents that should inherit it and that a unique child remains governed by its own ACL. Record the exact resync scope so an operator can repeat it during an incident.
8. Refresh ADLS Gen2 and custom push sources
ADLS Gen2
ACL changes in ADLS Gen2 require a resynchronization of the indexer or data source. A content-only incremental pass is not enough if it does not reread permissions. After the resync, query as a user whose access was removed and confirm that old results disappear within the approved latency.
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Custom push ingestion
Push pipelines must treat permission changes as document updates even when the text and content timestamp are unchanged. Reingest every affected document with the new permission fields, update the permission timestamp and emit a delete or tombstone when the source object is withdrawn. Batch updates carefully: a partial batch can leave a mixed state in which some documents reflect the new policy and others still authorize the old one.
Make refreshes observable
Expose the last successful ACL update, source event time, index receipt time and query-visible time. Alert when the difference exceeds the source’s approved threshold. A dashboard that shows only document-count freshness cannot reveal a permission lag in which text is current but authorization is not.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.9. Plan Elastic Enterprise Search migrations by version and ACL index
If the replacement involves upgrading or moving an Elastic Enterprise Search deployment, follow the supported version sequence rather than treating it as a generic reindex. Upgrades from the 7.x line require a 7.17.x prerequisite before 8.0, and Elasticsearch and Kibana minor versions must match.
Account for the 8.12 access-control index change
In the 8.12 access-control index naming change, a self-managed connector client that does not run with an Enterprise Search node does not migrate the ACL index automatically. Operators must perform the documented migration or manually recreate the ACL indices, resynchronize connectors and reissue connector API keys. Skipping this step can leave content searchable without the document-level security state that governed it before the change.
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Elastic states that Enterprise Search will no longer be available in Elastic version 9.0 and beyond. Treat that statement as a platform-lifecycle constraint: document the supported destination, the final readable state of the old indexes and the date by which rollback remains possible. Do not delete the old ACL indexes or revoke connector credentials until the observation window has ended.
10. Define cutover, rollback and evidence requirements
Cutover gate
Approve the switch only when every representative persona passes the visibility tests, newly granted and revoked access meet the chosen latency, deleted documents no longer appear, source links and keys are correct, and identity or permission-service failures fail closed. The approval record should include the tested dataset, query corpus, index version, ACL refresh times and outstanding exceptions.
Rollback design
Keep the old index readable and preserve its connector state during a defined observation window. Route traffic back to it if unauthorized results appear, revocations exceed the threshold, ACL refreshes stop, error rates rise, or source links become unreliable. Record the last successful refresh on both systems so rollback does not silently reintroduce an older authorization state.
After-cutover monitoring
- ACL and RBAC refresh lag by source and permission scope.
- Grant and revocation propagation time.
- Indexer, resync and push-ingestion failures.
- Identity-directory and group-expansion errors.
- Fail-closed 5xx responses and their causes.
- Unauthorized-result reports, visibility diffs and duplicate documents.
- Delete and move reconciliation failures.
Set alert thresholds from business risk and source change rates; the available platform guidance does not define one universal SLA.
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11. Troubleshoot the most common migration failures
A user still sees a document after access was revoked
- Confirm the source ACL changed and identify whether the permission was unique or inherited.
- For a SharePoint inherited change, run
/resyncwithoptions: ["permissions"]or a targeted/resetdocs. - For ADLS Gen2, resynchronize the indexer or data source.
- For custom push ingestion, reingest the affected document with the new ACL.
- Check the indexed permission timestamp and query using a fresh token, then verify caches and replicas are not serving an older response.
A newly added user receives no results
- Verify directory synchronization has created or updated the user’s canonical identity.
- Check whether access is direct or inherited through a nested group.
- Confirm the caller token contains the identifier stored in the document ACL.
- Trigger the source-specific permission refresh and measure the propagation time.
Results disappear during an identity-service outage
Determine whether the target returned a deliberate fail-closed error or an empty, apparently successful result. A 5xx with a clear operational signal is safer than a partial result set. Investigate retries, token validation, group expansion and ACL service dependencies before changing the security policy.
Content is current but authorization is old
Compare content and permission timestamps separately. A text indexer may have succeeded while a permission update was skipped. Repair the permission pipeline, reingest affected documents and add an alert that detects divergence between the two timestamps.
12. Evaluate replacement tools against security-specific criteria
Do not choose a replacement by relevance, latency or connector count alone. Ask vendors and implementation teams for concrete answers to each axis:
- Does the platform provide native query-time security trimming?
- How are Microsoft Entra, on-premises and other directory identities mapped?
- Are nested groups supported, and where are they expanded?
- How are inherited permissions refreshed at site, library, folder and item scope?
- Which indexer, webhook, resync and reset controls exist?
- What must custom push ingestion resend after an ACL change?
- Does an authorization-evaluation failure fail closed, and is the error observable?
- Can operators measure ACL lag independently from content lag?
- What migration tooling preserves access-control indexes and connector credentials?
- Which version sequences, API changes and retirement dates affect rollback?
- Can one index or a small dataset run in parallel with the production system?
Require a working demonstration using your representative personas and an inherited-permission change. A written feature claim is not evidence that the connector handles your directory topology or refresh events.
Practical document contract example
The following illustrates the information a push or connector pipeline should deliver. Field names are illustrative; align them with the target service’s schema and identity model.
{
"document_id": "repository/object/48291",
"source_url": "https://repository.example/object/48291",
"content_timestamp": "2026-10-17T09:30:00Z",
"permission_timestamp": "2026-10-17T09:34:12Z",
"allowed_users": ["user-object-id"],
"allowed_groups": ["group-object-id", "nested-group-object-id"],
"role_claims": ["project.read"],
"inherited_from": ["folder/48100"],
"deleted": false
}The important properties are stable identity, explicit authorization state, an auditable permission timestamp and a deletion signal. Do not publish this example as a literal schema without validating the target service’s supported field types and claim syntax.
Quick Recap
Migration completion checklist
- All connectors, permission scopes, inheritance rules and identity providers are inventoried.
- The target contract defines document keys, ACL or RBAC fields, timestamps, source links and deletion behavior.
- Directory synchronization resolves every identity format used by source ACLs.
- Nested groups, service principals and hybrid SharePoint mappings have passed tests.
- Each source has a documented permission-refresh trigger and latency threshold.
- SharePoint inherited changes use a permissions resync or targeted reset.
- ADLS Gen2 changes trigger a resynchronization.
- Custom push pipelines reingest affected documents when permissions change.
- Elastic version prerequisites, access-control index migration, connector resync and API-key rotation are complete where applicable.
- Dual-run comparisons cover grants, revocations, inheritance, deletes, moves, ranking and outage behavior.
- Fail-closed behavior and observable errors are acceptance criteria.
- The old index, ACL state and connector credentials remain available for the approved rollback window.
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