Is there a way to predict or estimate merge will be triggered during indexing time? I use Elasticsearch 1.7.2 and all settings about merge is by default.

Refresh interval won't always prevent refreshes. If you run out of memory budgeted to keep documents in memory before a refresh elasticsearch will trigger a refresh. Refreshes aren't merges either, though you are right in that not refreshing won't create the segments which have to later be merge…

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How to predict or estimate merge will be triggered

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The effect of refresh on segment merging Elasticsearch	4	1139	May 18, 2017
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How to predict or estimate merge will be triggered

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