[Bug]: NeptuneAnalyticsAdapter.is_empty() awaits synchronous function

[pinkgoldpeach]

Bug Description

Hi,

In the NeptuneAnalyticsAdapter in is_empty() query_result = await self._client.query(query) is called. However, self._client is a langchain_aws.graphs.neptune_graph.NeptuneAnalyticsGraph and query is synchronous.

Hence, this will throw an error [ERROR] TypeError: object list can't be used in 'await' expression.

is_empty()is used in search() therefore search with NeptuneAnalytics is not working.

Steps to Reproduce

1. Create a NeptuneAnalyticsGraph
2. Populate it, e.g. with cognify
3. Use search on the existing graph

Expected Behavior

That the synchronous function is not awaited and therefore is_empty() and search() run through without errors.

Actual Behavior

An error is thrown [ERROR] TypeError: object list can't be used in 'await' expression.

Environment

AWS Lambda with Python 3.13 and Langchain AWS

Logs/Error Messages

`[ERROR] TypeError: object list can't be used in 'await' expression
Traceback (most recent call last):
  File "/var/task/aws_lambda_powertools/logging/logger.py", line 548, in decorate
    return lambda_handler(event, context, *args, **kwargs)
  File "/var/task/lambda_function.py", line 221, in lambda_handler
    result = asyncio.run(MY_FUNCTION_NAME(query_text=query_text, top_k=5))
  File "/var/lang/lib/python3.13/asyncio/runners.py", line 195, in run
    return runner.run(main)
  File "/var/lang/lib/python3.13/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
  File "/var/lang/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
  File "/var/task/lambda_function.py", line 139, in MY_FUNCTION_NAME
    return await cognee.search(query_text=query_text, query_type=SearchType.GRAPH_COMPLETION, top_k=top_k)
  File "/var/task/cognee/api/v1/search/search.py", line 193, in search
    filtered_search_results = await search_function(
  File "/var/task/cognee/modules/search/methods/search.py", line 101, in search
    await no_access_control_search(
  File "/var/task/cognee/modules/search/methods/no_access_control_search.py", line 44, in no_access_control_search
    is_empty = await graph_engine.is_empty()
  File "/var/task/cognee/infrastructure/databases/hybrid/neptune_analytics/NeptuneAnalyticsAdapter.py", line 425, in is_empty
    query_result = await self._client.query(query)`

Additional Context

No response

Pre-submission Checklist

• I have searched existing issues to ensure this bug hasn't been reported already
• I have provided a clear and detailed description of the bug
• I have included steps to reproduce the issue
• I have included my environment details

[github-actions]

Hello @pinkgoldpeach, thank you for your interest in our work!

If this is a bug report, please provide screenshots and minimum viable code to reproduce your issue, otherwise we can not help you.

[Vasilije1990]

Handled