How does index refresh interval work in ElasticSearch?

Question

I set index.refresh_interval=-1, that means the indexReader would not be refreshed forever, but why I still could find some new docs after a while of indexing? Is there any other parameter to control the index refresh?

Let's suppose there is a parameter called maxDocsRefresh, that means when the new docs reach a limitation IndexReader would refresh automatically. However, the problem is that there could be some unsearchable docs since part of the docs didn't reach the limitation of index refresh.

keety · Accepted Answer · 2015-10-13 21:19:15Z

5

The refersh_interval setting provides a near real-time search ability to elasticsearch.

The following article provides a great explanation of what exactly occurs during a refresh and the difference between a refresh and flush.

Simply put refresh allows for the documents to be searchable before the lucene segment is flushed/commited to disk. However if you disable refresh it would eventually commit when the translog reaches a certain thresold and this would make the data searchable.

The following documents shows the parameters that can be used to tweak the flush settings.

edited Oct 13, 2015 at 21:19

answered Oct 13, 2015 at 21:13

keety

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