> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Deprecations and Removals

[localhost link]: http://localhost:3000/docs/4/fusion-server/release-notes/deprecations-and-removals

[mintlify link]: https://doc.lucidworks.com/docs/4/fusion-server/release-notes/deprecations-and-removals

[old doc.lw link]: https://doc.lucidworks.com/fusion/5.9/8855

## Active Deprecations

The expected removal versions listed in the **Active Deprecations** table below may not correspond to a planned release version. Removals take place *on or after* the expected removal version. If the expected removal is listed as 4.1.4, but Fusion 4.1.4 is not a planned release, the removal may take place in Fusion 4.2.0.

<Tip>
  **Fusion Connectors deprecations and removals**

  Deprecation and removal details for Fusion Connectors are found at [Fusion Connectors Deprecations and Removals](/docs/fusion-connectors/deprecations-and-removals).
</Tip>

| Feature         | Deprecated | Expected Removal | Notes                                                        |
| --------------- | ---------- | ---------------- | ------------------------------------------------------------ |
| Webapps API     | 4.2.0      | 4.3.0            | Webapps Appkit API                                           |
| Experiments API | 4.0.0      | 4.1.0            | Experiments are now managed through the `/spark` endpoints.  |
| Aggregator API  | 4.0.0      | 4.1.0            | Aggregations are now managed through the `/spark` endpoints. |

## Removals

| Feature                         | Removed | Notes |
| ------------------------------- | ------- | ----- |
| `/blobs/{id}/manifest` endpoint | 4.0.0   | -     |
| Synonyms API                    | 4.0.0   | -     |