Describe the bug

I'm trying to use Indexes.search in Python. The documentation has no examples so I'm kind of guessing on how it should be used, but it seems to just not work, and raises a C++ error and dumps core.

Steps to reproduce

from usearch.index import Index, Indexes
import numpy as np

ia = Index()
ia.load("foo.usearch")
ib = Index()
ib.load("bar.usearch")

# just take the first vector as a dummy value
query = np.array([ia[0]])

ix = Indexes([ia, ib])
ix.search(query)

Gives this error:

terminate called after throwing an instance of 'std::bad_function_call'
  what():  bad_function_call
Aborted (core dumped)

Expected behavior

The Indexes.search function returns a value. (The docs don't say what, so I'm not sure what to expect here either.)

USearch version

v2.12.0

Operating System

Ubuntu 24.04

Hardware architecture

x86

Which interface are you using?

Python bindings

Contact Details

No response

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Is there an existing issue for this?

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