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Issue: OpenSearch ignores incoming trace context headers, breaking distributed tracing

Issue: OpenSearch ignores incoming trace context headers, breaking distributed tracing: a task in LegoFlow-SWE (Harbor dataset). Problem: When an external client sends a request with standard trace propagation headers (e.g., traceparent ), the server currently ignores those headers and always…

The task

**Problem:** When an external client sends a request with standard trace propagation headers (e.g., `traceparent`), the server currently ignores those headers and always starts a new root trace. This prevents correlation of spans across service boundaries, breaking distributed tracing end-to-end.

Part of Lego-X/LegoFlow-SWE.