Opendistro Elasticsearch Azure repository plugin - azure

Question

I've been trying to use azure blob storage with opendistro elasticsearch for snapshot. I've passed account name and key for storage account but while trying to register repo. getting following error
{"error":{"root_cause":[{"type":"repository_verification_exception","reason":"[bk] path is not accessible on master node"}],"type":"repository_verification_exception","reason":"[bk] path is not accessible on master node","caused_by":{"type":"null_pointer_exception","reason":"Cannot invoke \"String.length()\" because \"host\" is null"}},"status":500}
also error on node
Caused by: org.elasticsearch.repositories.RepositoryVerificationException: [bk] path is not accessible on master node
at org.elasticsearch.repositories.blobstore.BlobStoreRepository.startVerification(BlobStoreRepository.java:1276) ~[elasticsearch-7.10.2.jar:7.10.2]
at org.elasticsearch.repositories.RepositoriesService$3.doRun(RepositoriesService.java:268) ~[elasticsearch-7.10.2.jar:7.10.2]
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:743) ~[elasticsearch-7.10.2.jar:7.10.2]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.10.2.jar:7.10.2]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[?:?]
at java.lang.Thread.run(Thread.java:832) [?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "String.length()" because "host" is null
at com.microsoft.azure.storage.core.Utility.isHostDnsName(Utility.java:533) ~[?:?]
at com.microsoft.azure.storage.core.Utility.determinePathStyleFromUri(Utility.java:521) ~[?:?]
at com.microsoft.azure.storage.StorageUri.<init>(StorageUri.java:71) ~[?:?]
at com.microsoft.azure.storage.core.PathUtility.appendPathToUri(PathUtility.java:124) ~[?:?]
at com.microsoft.azure.storage.core.PathUtility.appendPathToUri(PathUtility.java:108) ~[?:?]
at com.microsoft.azure.storage.blob.CloudBlobContainer.<init>(CloudBlobContainer.java:169) ~[?:?]
at com.microsoft.azure.storage.blob.CloudBlobClient.getContainerReference(CloudBlobClient.java:123) ~[?:?]
Following is my custom docker image
FROM amazon/opendistro-for-elasticsearch:1.13.0
RUN /usr/share/elasticsearch/bin/elasticsearch-plugin install --batch repository-azure
ENV AZURE_CLIENT_ACCOUNT <bas64 encoded account>
ENV AZURE_CLIENT_KEY <base64 encoded key>
RUN /usr/share/elasticsearch/bin/elasticsearch-keystore create
RUN echo $AZURE_CLIENT_ACCOUNT | /usr/share/elasticsearch/bin/elasticsearch-keystore add --stdin azure.client.default.account
RUN echo $AZURE_CLIENT_KEY | /usr/share/elasticsearch/bin/elasticsearch-keystore add --stdin azure.client.default.key
Can anyone help ?