Fix OpenSearch exporter mapper_parsing_exception

[chantzlarge]

Bug Report

latest

Symptom

What is the bug?

• The bug is a mapper_parsing_exception encountered when attempting to export traces to OpenSearch. This exception indicates a failure in parsing due to a class cast exception, specifically, an attempt to cast org.opensearch.index.mapper.KeywordFieldMapper to org.opensearch.index.mapper.ObjectMapper. This suggests an incompatibility or misconfiguration in the data schema or mapping used for trace data in OpenSearch.

What is the expected behavior?

• The expected behavior is for the OpenTelemetry Collector (otel-col) to successfully export trace data to OpenSearch without encountering schema-related parsing exceptions.

What is the actual behavior?

• The actual behavior observed is an error during the export process, which indicates that the data schema or mapping provided to OpenSearch is incorrect or incompatible. This prevents the successful export of trace data and results in data being rejected.

Reproduce

Steps to reproduce:

1. Configure the OpenTelemetry Collector with the opensearch/traces exporter.
2. Ensure that trace data being exported conforms to the expected schema or mapping configuration of the OpenSearch instance.
3. Attempt to export trace data to OpenSearch.
4. Observe the mapper_parsing_exception in the OpenTelemetry Collector logs.

Additional Context

Related issues:

• https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/31039
• https://github.com/opensearch-project/opensearch-catalog/issues/118

Error Logs:

Permanent error: {"type":"mapper_parsing_exception","reason":"failed to parse","caused_by":{"type":"class_cast_exception","reason":"class org.opensearch.index.mapper.KeywordFieldMapper cannot be cast to class org.opensearch.index.mapper.ObjectMapper (org.opensearch.index.mapper.KeywordFieldMapper and org.opensearch.index.mapper.ObjectMapper are in unnamed module of loader 'app')","caused_by":null}}