v1.16: Experimental: Disable new indexer (#3313)

Author: guimachiavelli

learn/resources/experimental_features_overview.mdx

@@ -59,3 +59,4 @@ Activating or deactivating experimental features this way does not require you t
 | [Search query embedding cache](/learn/self_hosted/configure_meilisearch_at_launch#search-query-embedding-cache) | Enable a cache for search query embeddings                 | CLI flag or environment variable            |
 | [Uncompressed snapshots](/learn/self_hosted/configure_meilisearch_at_launch#uncompressed-snapshots) | Disable snapshot compaction                                            | CLI flag or environment variable            |
 | [Maximum batch payload size](/learn/self_hosted/configure_meilisearch_at_launch#maximum-batch-payload-size) | Limit batch payload size                                       | CLI flag or environment variable            |
+| [Disable new indexer](/learn/self_hosted/configure_meilisearch_at_launch)                    | Use previous settings indexer                        | CLI flag or environment variable            |

learn/self_hosted/configure_meilisearch_at_launch.mdx

@@ -538,6 +538,18 @@ Helps running Meilisearch in cluster environments. It does this by modifying tas
 - Allows you to manually set task uids by adding a custom `TaskId` header to your API requests
 - Allows you to dry register tasks by specifying a `DryRun: true` header in your request
 
+### Disable new indexer <NoticeTag type="experimental" label="experimental" />
+
+<Warning>
+🚩 This option does not take any values. Assigning a value will throw an error. 🚩
+</Warning>
+
+**Environment variable**: `MEILI_EXPERIMENTAL_NO_EDITION_2024_FOR_SETTINGS`<br />
+**CLI option**: `--experimental-no-edition-2024-for-settings`<br />
+**Default value**: `None`<br />
+
+Falls back to previous settings indexer.
+
 ### SSL options
 
 #### SSL authentication path