[skip ci] update nightly cron (#2324)

* [skip ci] update nightly cron
Signed-off-by: Nzw <zw@milvus.io>

* update cron
Signed-off-by: Nzw <zw@milvus.io>
Co-authored-by: Nzw <zw@milvus.io>

ci/jenkins/step/shardsDevNightlyTest.groovy

@@ -6,7 +6,7 @@ timeout(time: 180, unit: 'MINUTES') {
         checkout([$class: 'GitSCM', branches: [[name: "nightly"]], userRemoteConfigs: [[url: "https://github.com/milvus-io/milvus-helm.git", name: 'origin', refspec: "+refs/heads/nightly:refs/remotes/origin/nightly"]]])
         retry(3) {
             try {
-                sh "helm install --wait --timeout 300s --set mishards.enabled=true --set persistence.enabled=true --set image.repository=registry.zilliz.com/milvus/engine --set image.tag=${DOCKER_VERSION} --set image.pullPolicy=Always --set service.type=ClusterIP -f ci/db_backend/mysql_${BINARY_VERSION}_values.yaml --namespace milvus ${env.SHARDS_HELM_RELEASE_NAME} ."
+                sh "helm install --wait --timeout 300s --set mishards.enabled=true --set persistence.enabled=true --set image.repository=registry.zilliz.com/milvus/engine --set mishards.imag.tag=0.9.0-rc --set image.tag=${DOCKER_VERSION} --set image.pullPolicy=Always --set service.type=ClusterIP -f ci/db_backend/mysql_${BINARY_VERSION}_values.yaml --namespace milvus ${env.SHARDS_HELM_RELEASE_NAME} ."
             } catch (exc) {
                 def helmStatusCMD = "helm get manifest --namespace milvus ${env.SHARDS_HELM_RELEASE_NAME} | kubectl describe -n milvus -f - && \
                                      kubectl logs --namespace milvus -l \"app=milvus,release=${env.SHARDS_HELM_RELEASE_NAME}\" -c milvus && \

tests/milvus_python_test/utils.py

@@ -607,7 +607,7 @@ def get_search_param(index_type):
     elif index_type == IndexType.HNSW:
         return {"ef": 64}
     elif index_type == IndexType.RNSG:
-        return {"search_length": 50}
+        return {"search_length": 100}
     elif index_type == IndexType.ANNOY:
         return {"search_k": 100}