From f8d2f26ddfc93e72293bde35603b086085f2f21e Mon Sep 17 00:00:00 2001
From: Eivind Jahren <ejah@equinor.com>
Date: Mon, 14 Oct 2024 08:39:38 +0200
Subject: [PATCH] Aggregate duplicate indices by mean in dark storage

---
 src/ert/dark_storage/common.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ert/dark_storage/common.py b/src/ert/dark_storage/common.py
index 678b0f41a1e..4dac30ba4cd 100644
--- a/src/ert/dark_storage/common.py
+++ b/src/ert/dark_storage/common.py
@@ -121,6 +121,9 @@ def data_for_key(
             .to_pandas()
         )
         df = df.set_index(["Date", "Realization"])
+        # This performs the same aggragation by mean of duplicate values
+        # as in ert/analysis/_es_update.py
+        df = df.groupby(["Date", "Realization"]).mean()
         data = df.unstack(level="Date")
         data.columns = data.columns.droplevel(0)
         try: