The quickest way to do this is to run a zero size, terms aggregation on the field. Using the Kibana sample log data set as an example, you would run; GET kibana_sample_data_logs/_search { "size": "0", "aggs": { "unique_values": { "terms": { "field": "agent.keyword" } …

How to retrieve all unique values from a given field

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How to retrieve all unique values from a given field