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@@ -201,18 +201,6 @@ spinning platter drives instead, decrease this to 1.
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[float]
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==== SerialMergeScheduler
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-A merge scheduler that simply does each merge sequentially using the
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-calling thread (blocking the operations that triggered the merge or the
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-index operation). This merge scheduler has a merge thread pool that
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-explicitly schedules merges, and it makes sure that merges are serial
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-within a shard, yet concurrent across multiple shards.
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-
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-The scheduler supports the following settings:
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-
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-`index.merge.scheduler.max_merge_at_once`::
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-
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-The maximum number of merges a single merge run performs. This setting prevents
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-executing unlimited amount of merges in a loop until another shards has a
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-chance to get a merge thread from the pool. If this limit is reached the
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-merge thread returns to the pool and continues once the the call to a single
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-shards is executed. The default is `5`
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+This is accepted for backwards compatibility, but just uses
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+ConcurrentMergeScheduler with index.merge.scheduler.max_thread_count
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+set to 1 so that only 1 merge may run at a time.
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mikemccand