Maximum number of concurrent reindexing tasks in ES cluster

I was working with reindexing tasks and wanted to understand if ES sets any restriction on the number of concurrent reindexing tasks that can run in the cluster at any point of time and fails the new tasks if cluster already has threshold number of reindexing tasks running? Although I couldn't get any documentation of the same here - Reindex API | Elasticsearch Guide [7.16] | Elastic

I don't believe there is, but these would be bounded by the threadpools on each node. So I guess technically there would be one you could calculate if you really wanted to know, but it's node size dependant.

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