diff --git a/src/plugins/data/common/search/aggs/metrics/count_fn.test.ts b/src/plugins/data/common/search/aggs/metrics/count_fn.test.ts
index 1458dd5e53b73..32189f07581e6 100644
--- a/src/plugins/data/common/search/aggs/metrics/count_fn.test.ts
+++ b/src/plugins/data/common/search/aggs/metrics/count_fn.test.ts
@@ -34,7 +34,6 @@ describe('agg_expression_functions', () => {
             "id": undefined,
             "params": Object {
               "customLabel": undefined,
-              "json": undefined,
             },
             "schema": undefined,
             "type": "count",
diff --git a/src/plugins/data/common/search/aggs/metrics/count_fn.ts b/src/plugins/data/common/search/aggs/metrics/count_fn.ts
index 059f663349588..7d4616ffdc619 100644
--- a/src/plugins/data/common/search/aggs/metrics/count_fn.ts
+++ b/src/plugins/data/common/search/aggs/metrics/count_fn.ts
@@ -54,12 +54,6 @@ export const aggCount = (): FunctionDefinition => ({
         defaultMessage: 'Schema to use for this aggregation',
       }),
     },
-    json: {
-      types: ['string'],
-      help: i18n.translate('data.search.aggs.metrics.count.json.help', {
-        defaultMessage: 'Advanced json to include when the agg is sent to Elasticsearch',
-      }),
-    },
     customLabel: {
       types: ['string'],
       help: i18n.translate('data.search.aggs.metrics.count.customLabel.help', {