Initiate a detection alert migration

Spaces method and path for this operation:

<div><span class="operation-verb post">post</span>&nbsp;<span class="operation-path">/s/{space_id}/api/detection_engine/signals/migration</span></div>

Refer to Spaces for more information.

DEPRECATED. Legacy API for on-demand reindexing of old .siem-signals-* alert indices. Do not build new integrations; upgrade the Elastic Stack and rely on product-managed data lifecycle instead. WARNING: Migrations can be resource intensive and should be planned during a maintenance window.

Initiate a migration of detection alerts. Migrations are initiated per index. The process is not destructive and should not remove existing data, but it can consume significant cluster resources. Plan capacity accordingly.