Fix log message when unable to find a reference id for a document #416

Job	Run time
gradle-tests	6h 0m 19s
console-python-tests (lib/console_link)	26s
python-e2e-tests	15m 30s
console-python-tests (cluster_tools)	2m 13s
python-lint	7s
style-check	1m 26s
console-python-tests (console_api)	27s
workflow-info	2s
link-checker	4s
node-tests (./deployment/cdk/opensearch-service-migration)	44s
node-tests (./deployment/migration-assistant-solution)	24s
all-ci-checks-pass	1s
	6h 21m 43s

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