Redact credentials from connection configuration logs

[yhmo]

• Redact passwords, tokens, authorization values, and URI user-info from V1 and V2 diagnostic output.
• Keep standalone usernames visible for authentication and RBAC troubleshooting.
• Sanitize global-cluster endpoint logs throughout connection and topology refresh paths.
• Centralize redaction logic in a shared utility and add regression coverage.

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This pull-request has been approved by: yhmo

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[Copilot]

Pull request overview

This PR aims to prevent accidental credential exposure by redacting sensitive fields (tokens/usernames/passwords/authorization) from configuration and request parameter toString() output, and adds regression tests to ensure redaction is preserved over time.

Changes:

• Redact sensitive fields in toString() for V2 ConnectConfig and V1 ConnectParam.
• Redact sensitive fields in toString() for credential request params (CreateCredentialParam, UpdateCredentialParam).
• Add tests covering V2 config redaction and V1 connect/credential parameter redaction.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
sdk-core/src/test/java/io/milvus/v2/client/MilvusClientV2Test.java	Adds a regression test asserting V2 ConnectConfig.toString() redacts token/username/password.
sdk-core/src/test/java/io/milvus/param/CredentialRedactionTest.java	New tests asserting redaction for ConnectParam, MultiConnectParam, and credential request params.
sdk-core/src/main/java/io/milvus/v2/client/ConnectConfig.java	Redacts token/username/password in toString().
sdk-core/src/main/java/io/milvus/param/credential/UpdateCredentialParam.java	Redacts username/oldPassword/newPassword in toString().
sdk-core/src/main/java/io/milvus/param/credential/CreateCredentialParam.java	Redacts username/password in toString().
sdk-core/src/main/java/io/milvus/param/ConnectParam.java	Redacts token/authorization/userName in toString().

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[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 6 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@acab35b). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
.../io/milvus/v2/client/globalcluster/GlobalStub.java	0.00%	5 Missing ⚠️
.../main/java/io/milvus/v2/client/MilvusClientV2.java	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (75.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1992   +/-   ##
=========================================
  Coverage          ?   65.10%           
  Complexity        ?     4263           
=========================================
  Files             ?      473           
  Lines             ?    26442           
  Branches          ?     2510           
=========================================
  Hits              ?    17215           
  Misses            ?     7870           
  Partials          ?     1357           

Files with missing lines	Coverage Δ
.../java/io/milvus/common/utils/RedactCredential.java	100.00% <100.00%> (ø)
...re/src/main/java/io/milvus/param/ConnectParam.java	64.43% <100.00%> (ø)
...milvus/param/credential/CreateCredentialParam.java	72.72% <100.00%> (ø)
...milvus/param/credential/UpdateCredentialParam.java	73.33% <100.00%> (ø)
...c/main/java/io/milvus/v2/client/ConnectConfig.java	66.66% <100.00%> (ø)
...vus/v2/client/globalcluster/TopologyRefresher.java	53.48% <100.00%> (ø)
...o/milvus/v2/service/cdc/request/MilvusCluster.java	63.26% <100.00%> (ø)
.../milvus/v2/service/rbac/request/CreateUserReq.java	77.77% <100.00%> (ø)
...vus/v2/service/rbac/request/UpdatePasswordReq.java	75.60% <100.00%> (ø)
.../main/java/io/milvus/v2/client/MilvusClientV2.java	53.20% <0.00%> (ø)
... and 1 more

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