Fix Kibana 3 terms_stats with low document counts

fix-kibana-terms_stats.js

// ==UserScript==
// @name         Fix Kibana 3 terms_stats
// @namespace    http://chivil.com/
// @version      1.0
// @description  Try fixing Kibana 3 terms_stats queries not being accurate with low document count
// @author       Romuald Brunet <[email protected]>
// @match        -your-kibana-url-
// @grant        none
// ==/UserScript==

(function(original_send) {
    // Works for me, but might not work for you
    // See https://www.elastic.co/guide/en/elasticsearch/reference/1.7/search-facets-terms-stats-facet.html#search-facets-terms-stats-facet
    var shard_size = 2000;

    window.XMLHttpRequest.prototype.send = function(data) {
        // Overwrite the shard_size in the terms_stats queries only
        try {
            var copy = JSON.parse(data);
            copy.facets.terms.terms_stats.shard_size = shard_size;
            data = JSON.stringify(copy);
            console.log("Patched a XHR terms_stats.shard_size to " + shard_size);
        } catch (e) {
            // Ignore errors, no terms_stats in the XMLHttpRequest (probably)
        }

        return original_send.call(this, data);
    };
  })(window.XMLHttpRequest.prototype.send);