[FLINK-38455] Fix ES8 pipeline connector failure when batch contains only SchemaChangeEvents#4270
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lvyanquan merged 1 commit intoapache:masterfrom Feb 25, 2026
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…property 'BulkRequest.operations' error
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…property 'BulkRequest.operations' error (apache#4270)
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…property 'BulkRequest.operations' error (apache#4270)
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…property 'BulkRequest.operations' error (apache#4270)
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This close https://issues.apache.org/jira/browse/FLINK-38455
When the pipeline starts, Flink CDC sends CreateTableEvent (a SchemaChangeEvent) before any DataChangeEvent. The ElasticsearchEventSerializer returns null for SchemaChangeEvent since it only updates the internal schema cache and does not produce an actual ES operation.
In Elasticsearch8AsyncWriter.submitRequestEntries(), operations with null BulkOperationVariant are skipped via continue. However, when all operations in a batch are SchemaChangeEvent (which is common at pipeline startup), no operation is added to the BulkRequest.Builder. Calling br.build() on an empty builder throws:
because operations is a required field in the ES8 Java Client's BulkRequest.
The fix checks whether any valid operation was added before calling br.build(). If the batch is effectively empty, it returns success immediately without sending a request to Elasticsearch.