diff --git a/udata/core/dataservices/models.py b/udata/core/dataservices/models.py
index 24db36b1b9..a3b7311bb2 100644
--- a/udata/core/dataservices/models.py
+++ b/udata/core/dataservices/models.py
@@ -1,5 +1,7 @@
 from datetime import datetime
 
+from elasticsearch_dsl import Search, query
+
 import udata.core.contact_point.api_fields as contact_api_fields
 import udata.core.dataset.api_fields as datasets_api_fields
 from udata.api_fields import field, function_field, generate_fields
@@ -23,6 +25,42 @@
 DATASERVICE_FORMATS = ["REST", "WMS", "WSL"]
 
 
+def build_search_query(query_text: str, score_functions):
+    return query.Q(
+        "bool",
+        should=[
+            query.Q(
+                "function_score",
+                query=query.Bool(
+                    should=[
+                        query.MultiMatch(
+                            query=query_text,
+                            type="phrase",
+                            fields=["title^15", "acronym^15", "description^8"],
+                        )
+                    ]
+                ),
+                functions=score_functions,
+            ),
+            query.Q(
+                "function_score",
+                query=query.Bool(
+                    should=[
+                        query.MultiMatch(
+                            query=query_text,
+                            type="cross_fields",
+                            fields=["title^7", "acronym^7", "description^4"],
+                            operator="and",
+                        )
+                    ]
+                ),
+                functions=score_functions,
+            ),
+            # query.Match(title={"query": query_text, "fuzziness": "AUTO:4,6"}),
+        ],
+    )
+
+
 class DataserviceQuerySet(OwnedQuerySet):
     def visible(self):
         return self(archived_at=None, deleted_at=None, private=False)
@@ -58,7 +96,12 @@ class HarvestMetadata(db.EmbeddedDocument):
 
 
 @generate_fields()
-@elasticsearch()
+@elasticsearch(
+    score_functions_description={
+        "metrics.followers": {"factor": 4, "modifier": "sqrt", "missing": 1}
+    },
+    build_search_query=build_search_query,
+)
 class Dataservice(WithMetrics, Owned, db.Document):
     meta = {
         "indexes": [
diff --git a/udata/core/elasticsearch/__init__.py b/udata/core/elasticsearch/__init__.py
index 94dd0cb700..2bd39c7637 100644
--- a/udata/core/elasticsearch/__init__.py
+++ b/udata/core/elasticsearch/__init__.py
@@ -1,3 +1,4 @@
+import json
 import logging
 import random
 import string
@@ -12,13 +13,17 @@
     Field,
     Float,
     Index,
+    InnerDoc,
     Integer,
     Keyword,
     Nested,
+    Object,
+    Q,
     Search,
     Text,
     analyzer,
     connections,
+    query,
     token_filter,
     tokenizer,
 )
@@ -74,15 +79,21 @@
 client = connections.create_connection(hosts=["localhost"])
 
 
-def elasticsearch(**kwargs):
+def elasticsearch(score_functions_description={}, build_search_query=None, **kwargs):
     def wrapper(cls):
-        cls.elasticsearch = generate_elasticsearch_model(cls)
+        cls.elasticsearch = generate_elasticsearch_model(
+            cls,
+            score_functions_description=score_functions_description,
+            build_search_query=build_search_query,
+        )
         return cls
 
     return wrapper
 
 
-def generate_elasticsearch_model(cls: type) -> type:
+def generate_elasticsearch_model(
+    cls: type, score_functions_description, build_search_query
+) -> type:
     index_name = cls._get_collection_name()
 
     # Testing name to have a new index in each test.
@@ -103,10 +114,45 @@ class Index:
     def elasticsearch_index(cls, document, **kwargs):
         convert_mongo_document_to_elasticsearch_document(document).save()
 
+    score_functions = [
+        query.SF("field_value_factor", field=key, **value)
+        for key, value in score_functions_description.items()
+    ]
+
     def elasticsearch_search(query_text):
-        s = Search(using=client, index=index_name).query("match", title=query_text)
-        response = s.execute()
-        print(response)
+        s: Search = ElasticSearchModel.search()
+
+        if query_text:
+            query = build_search_query(query_text, score_functions)
+        else:
+            query = Q(
+                "function_score",
+                query=query.MatchAll(),
+                functions=score_functions,
+            )
+
+        print("---------------------")
+        print("---------------------")
+        print("---------------------")
+        print("---------------------")
+        print("---------------------")
+        print(score_functions_description)
+        for field in score_functions_description.keys():
+            print(field)
+            levels = field.split(".")
+            print(levels)
+
+            if len(levels) == 1:
+                pass
+            elif len(levels) == 2:
+                query = Q("nested", path=levels[0], query=query)
+            else:
+                raise RuntimeError(
+                    f"This system only support one level deep score function fields. '{field}' contains two or more dots."
+                )
+
+        print(json.dumps(s.query(query).to_dict(), indent=2))
+        response = s.query(query).execute()
 
         # Get all the models from MongoDB to fetch all the correct fields.
         models = {
@@ -151,6 +197,8 @@ def convert_db_field_to_elasticsearch(field, searchable: bool | str) -> Field:
         return Boolean()
     elif isinstance(field, mongo_fields.DateTimeField):
         return Date()
+    elif isinstance(field, mongo_fields.DictField):
+        return Nested()
     elif isinstance(field, mongo_fields.ReferenceField):
         return Nested(field.document_type_obj.__elasticsearch_model__)
     else:
@@ -160,6 +208,7 @@ def convert_db_field_to_elasticsearch(field, searchable: bool | str) -> Field:
 def convert_mongo_document_to_elasticsearch_document(document: MongoDocument) -> Document:
     attributes = {}
     attributes["id"] = str(document.id)
+    attributes["meta"] = {"id": str(document.id)}
 
     for key, field, searchable in get_searchable_fields(document.__class__):
         attributes[key] = getattr(document, key)
@@ -180,7 +229,7 @@ def ensure_index_exists(index: Index, index_name: str) -> None:
     if index.exists():
         return
 
-    now = datetime.now(datetime.UTC).strftime("%Y-%m-%d-%H-%M")
+    now = datetime.utcnow().strftime("%Y-%m-%d-%H-%M")
     index_name_with_suffix = f"{index_name}-{now}"
 
     # Because we create the index manually (`elasticsearch_dsl` creates an index
diff --git a/udata/core/metrics/models.py b/udata/core/metrics/models.py
index 0baf737f36..9823e5a367 100644
--- a/udata/core/metrics/models.py
+++ b/udata/core/metrics/models.py
@@ -8,6 +8,7 @@ class WithMetrics(object):
     metrics = field(
         db.DictField(),
         readonly=True,
+        searchable=True,  # TODO change to indexable
     )
 
     __metrics_keys__ = []
diff --git a/udata/tests/api/test_dataservices_api.py b/udata/tests/api/test_dataservices_api.py
index 07527fa8c7..75866f0400 100644
--- a/udata/tests/api/test_dataservices_api.py
+++ b/udata/tests/api/test_dataservices_api.py
@@ -319,8 +319,18 @@ def test_dataservice_api_create_with_custom_user_or_org(self):
         self.assertEqual(dataservice.organization.id, me_org.id)
 
     def test_elasticsearch(self):
-        dataservice_a = DataserviceFactory(title="Hello AMD world!")
-        dataservice_b = DataserviceFactory(title="Other one")
+        dataservice_a = DataserviceFactory(
+            title="Hello AMD world!",
+            metrics={
+                "followers": 42,
+            },
+        )
+        dataservice_b = DataserviceFactory(
+            title="Other one",
+            metrics={
+                "followers": 1337,
+            },
+        )
         time.sleep(1)
 
         dataservices = Dataservice.__elasticsearch_search__("AMDAC")
@@ -330,10 +340,12 @@ def test_elasticsearch(self):
 
         dataservice_b.title = "Hello AMD world!"
         dataservice_b.save()
-        time.sleep(1)
+        time.sleep(3)
 
         dataservices = Dataservice.__elasticsearch_search__("AMDAC")
 
         assert len(dataservices) == 2
-        assert dataservices[0].id == dataservice_a.id
-        assert dataservices[1].id == dataservice_b.id
+
+        # `dataservice_b` should be first because it has a lot of followers
+        assert dataservices[0].id == dataservice_b.id
+        assert dataservices[1].id == dataservice_a.id