Fix: Move pagerank field from create to update dataset API (#8217)

### What problem does this PR solve?

- Remove pagerank from CreateDatasetReq and add to UpdateDatasetReq
- Add pagerank update logic in dataset update endpoint
- Update API documentation to reflect changes
- Modify related test cases and SDK references

#8208

This change makes pagerank a mutable property that can only be set after
dataset creation, and only when using elasticsearch as the doc engine.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

test/testcases/test_sdk_api/test_dataset_mangement/test_create_dataset.py

@@ -344,49 +344,6 @@ class TestDatasetCreate:
             client.create_dataset(**payload)
         assert "not instance of" in str(excinfo.value), str(excinfo.value)
 
-    @pytest.mark.p2
-    @pytest.mark.parametrize(
-        "name, pagerank",
-        [
-            ("pagerank_min", 0),
-            ("pagerank_mid", 50),
-            ("pagerank_max", 100),
-        ],
-        ids=["min", "mid", "max"],
-    )
-    def test_pagerank(self, client, name, pagerank):
-        payload = {"name": name, "pagerank": pagerank}
-        dataset = client.create_dataset(**payload)
-        assert dataset.pagerank == pagerank, str(dataset)
-
-    @pytest.mark.p3
-    @pytest.mark.parametrize(
-        "name, pagerank, expected_message",
-        [
-            ("pagerank_min_limit", -1, "Input should be greater than or equal to 0"),
-            ("pagerank_max_limit", 101, "Input should be less than or equal to 100"),
-        ],
-        ids=["min_limit", "max_limit"],
-    )
-    def test_pagerank_invalid(self, client, name, pagerank, expected_message):
-        payload = {"name": name, "pagerank": pagerank}
-        with pytest.raises(Exception) as excinfo:
-            client.create_dataset(**payload)
-        assert expected_message in str(excinfo.value), str(excinfo.value)
-
-    @pytest.mark.p3
-    def test_pagerank_unset(self, client):
-        payload = {"name": "pagerank_unset"}
-        dataset = client.create_dataset(**payload)
-        assert dataset.pagerank == 0, str(dataset)
-
-    @pytest.mark.p3
-    def test_pagerank_none(self, client):
-        payload = {"name": "pagerank_unset", "pagerank": None}
-        with pytest.raises(Exception) as excinfo:
-            client.create_dataset(**payload)
-        assert "not instance of" in str(excinfo.value), str(excinfo.value)
-
     @pytest.mark.p1
     @pytest.mark.parametrize(
         "name, parser_config",
@@ -689,6 +646,7 @@ class TestDatasetCreate:
             {"name": "chunk_count", "chunk_count": 1},
             {"name": "token_num", "token_num": 1},
             {"name": "status", "status": "1"},
+            {"name": "pagerank", "pagerank": 50},
             {"name": "unknown_field", "unknown_field": "unknown_field"},
         ],
     )

test/testcases/test_sdk_api/test_dataset_mangement/test_update_dataset.py

@@ -13,6 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+import os
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from operator import attrgetter
 
@@ -324,6 +325,7 @@ class TestDatasetUpdate:
             dataset.update({"chunk_method": None})
         assert "Input should be 'naive', 'book', 'email', 'laws', 'manual', 'one', 'paper', 'picture', 'presentation', 'qa', 'table' or 'tag'" in str(excinfo.value), str(excinfo.value)
 
+    @pytest.mark.skipif(os.getenv("DOC_ENGINE") == "infinity", reason="#8208")
     @pytest.mark.p2
     @pytest.mark.parametrize("pagerank", [0, 50, 100], ids=["min", "mid", "max"])
     def test_pagerank(self, client, add_dataset_func, pagerank):
@@ -334,6 +336,30 @@ class TestDatasetUpdate:
         retrieved_dataset = client.get_dataset(name=dataset.name)
         assert retrieved_dataset.pagerank == pagerank, str(retrieved_dataset)
 
+    @pytest.mark.skipif(os.getenv("DOC_ENGINE") == "infinity", reason="#8208")
+    @pytest.mark.p2
+    def test_pagerank_set_to_0(self, client, add_dataset_func):
+        dataset = add_dataset_func
+        dataset.update({"pagerank": 50})
+        assert dataset.pagerank == 50, str(dataset)
+
+        retrieved_dataset = client.get_dataset(name=dataset.name)
+        assert retrieved_dataset.pagerank == 50, str(retrieved_dataset)
+
+        dataset.update({"pagerank": 0})
+        assert dataset.pagerank == 0, str(dataset)
+
+        retrieved_dataset = client.get_dataset(name=dataset.name)
+        assert retrieved_dataset.pagerank == 0, str(retrieved_dataset)
+
+    @pytest.mark.skipif(os.getenv("DOC_ENGINE") != "infinity", reason="#8208")
+    @pytest.mark.p2
+    def test_pagerank_infinity(self, client, add_dataset_func):
+        dataset = add_dataset_func
+        with pytest.raises(Exception) as excinfo:
+            dataset.update({"pagerank": 50})
+        assert "'pagerank' can only be set when doc_engine is elasticsearch" in str(excinfo.value), str(excinfo.value)
+
     @pytest.mark.p2
     @pytest.mark.parametrize(
         "pagerank, expected_message",