How to check, whether an index is empty in Elasticsearch?

Question

In a java application I want to find out, whether my index is empty or not (containing zero documents, or containing at least one documents).

I have the feeling, that counting all documents (by sending a search request with size=0) is not readable and might not be optimal in performance.

Is there a dedicated way for to check, whether an index is empty?

Mysterion · Accepted Answer · 2017-02-15 15:44:44Z

1

You could do that with the following Java code:

IndicesStatsResponse indicesStatsResponse = client().admin().indices().prepareStats(INDEX).get();

indicesStatsResponse.getIndices().get(INDEX).getTotal().docs.getCount());

where client is org.elasticsearch.client.Client and INDEX is the String, representing the name of the index.

Interesting is, that some simple test shows, that in average, this request is faster by 20%, than doing MatchAllDocsQuery. But I'm not sure if this is a correct test. Maybe I will do a proper one later

answered Feb 15, 2017 at 15:44

Mysterion

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