MLE-26966 Simplifying Nuclia options

[rjrudin]

Only need a NUA key by default now. Removed region, added API URL as a fallback. Touched up logging some more, needed to get the filename in there for debug purposes.

[github-actions]

Copyright Validation Results
Total: 5 | Passed: 5 | Failed: 0 | Skipped: 0 | at: 2026-02-04 16:11:42 UTC | commit: 250a4af

✅ Valid Files

• marklogic-spark-connector/src/main/java/com/marklogic/spark/Options.java
• marklogic-spark-connector/src/main/java/com/marklogic/spark/core/DocumentPipelineFactory.java
• marklogic-spark-connector/src/main/java/com/marklogic/spark/core/nuclia/NucliaClient.java
• marklogic-spark-connector/src/test/java/com/marklogic/spark/core/DocumentPipelineFactoryTest.java
• marklogic-spark-connector/src/test/java/com/marklogic/spark/writer/nuclia/NucliaAdHocTest.java

✅ All files have valid copyright headers!

[Copilot]

Pull request overview

This PR simplifies the Nuclia integration by replacing the region-based API key approach with a single NUA key configuration. The NUA key is now the only required option, with the API URL configurable as an optional fallback instead of requiring a region specification.

Changes:

• Replaced WRITE_NUCLIA_API_KEY with WRITE_NUCLIA_NUA_KEY and removed WRITE_NUCLIA_REGION requirement
• Introduced a Builder pattern for NucliaClient construction with optional API URL configuration
• Updated test files to use the new NUA key environment variable and option naming

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
NucliaAdHocTest.java	Updated test to use new NUCLIA_NUA_KEY environment variable and removed region configuration
DocumentPipelineFactoryTest.java	Updated all test cases to use new NUA key option and removed region-related test
NucliaClient.java	Refactored to use Builder pattern with NUA key, added default API URL, and removed region parameter
DocumentPipelineFactory.java	Updated to use Builder pattern for NucliaClient construction with optional API URL
Options.java	Renamed API key option to NUA key and replaced region option with API URL

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[Copilot]

The HTTP client is created without applying the timeout configuration from builder.timeoutSeconds. The read timeout should be set using .readTimeout(builder.timeoutSeconds, TimeUnit.SECONDS) in the builder chain.

Suggested change

	this.httpClient = new OkHttpClient.Builder().build();
	this.httpClient = new OkHttpClient.Builder()
	.readTimeout(this.timeoutSeconds, TimeUnit.SECONDS)
	.build();