diff --git a/elasticsearch/mapping_index.py b/elasticsearch/mapping_index.py
index a2accd1b..9f3d2df7 100644
--- a/elasticsearch/mapping_index.py
+++ b/elasticsearch/mapping_index.py
@@ -275,6 +275,7 @@ class UniteLegaleMapping(InnerDoc):
     est_association = Boolean()
     est_finess = Boolean()
     est_bio = Boolean()
+    est_ess = Boolean()
     est_organisme_formation = Boolean()
     liste_id_organisme_formation = Text()
     est_qualiopi = Boolean()
diff --git a/elasticsearch/process_unites_legales.py b/elasticsearch/process_unites_legales.py
index 10348cf3..98784944 100644
--- a/elasticsearch/process_unites_legales.py
+++ b/elasticsearch/process_unites_legales.py
@@ -151,6 +151,9 @@ def process_unites_legales(chunk_unites_legales_sqlite):
             unite_legale["est_entrepreneur_spectacle"]
         )
 
+        # ESS
+        unite_legale_processed["est_ess"] = sqlite_str_to_bool(unite_legale["est_ess"])
+
         # Egapro
         unite_legale_processed["egapro_renseignee"] = sqlite_str_to_bool(
             unite_legale["egapro_renseignee"]