Lunr search with --http mode

Hello,
When I tried to use offline search functionality I get such error in pop-up window:

Error importing module doc-search:

Traceback (most recent call last):
  File "/home/al-pa/localPython/py380/lib/python3.8/site-packages/pdoc/__init__.py", line 225, in import_module
    module = importlib.import_module(module_path)
  File "/home/al-pa/localPython/py380/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'doc-search'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/al-pa/localPython/py380/lib/python3.8/site-packages/pdoc/cli.py", line 234, in do_GET
    out = self.html()
  File "/home/al-pa/localPython/py380/lib/python3.8/site-packages/pdoc/cli.py", line 263, in html
    return pdoc.html(self.import_path_from_req_url,
  File "/home/al-pa/localPython/py380/lib/python3.8/site-packages/pdoc/__init__.py", line 176, in html
    mod = Module(import_module(module_name, reload=reload),
  File "/home/al-pa/localPython/py380/lib/python3.8/site-packages/pdoc/__init__.py", line 227, in import_module
    raise ImportError('Error importing {!r}: {}: {}'
ImportError: Error importing 'doc-search': ModuleNotFoundError: No module named 'doc-search'

pip install doc-search tells me that
ERROR: Could not find a version that satisfies the requirement doc-search
ERROR: No matching distribution found for doc-search

Could you please help me to understand what I am missing?

P.S.

$ python --version
Python 3.8.0

$ pdoc --version
pdoc 0.9.2

$ pip --version
pip 20.3.3 from /home/al-pa/localPython/py380/lib/python3.8/site-packages/pip (python 3.8)

P.P.S. running pdoc with such command:
pdoc3 --html --http localhost:1234 -c lunr_search=True <module_name>

Thank you!

Start by reproducing the reported pdoc3 --html --http localhost:1234 -c lunr_search=True <module_name> command with Python 3.8 and pdoc 0.9.2, then trace why the HTTP request attempts to import doc-search. Done means offline Lunr search works in HTTP mode without the reported import error, with the relevant behavior covered by a regression test.