readthedocs-sphinx-search - Search as you type for Read the Docs
readthedocs-sphinx-search is a Sphinx extension to enable search as you type for docs hosted on Read the Docs.
Try it at https://readthedocs-sphinx-search.readthedocs.io/en/latest/?rtd_search=testing.
Installation
pip install readthedocs-sphinx-search
Configuration
Add this extension in your conf.py file as:
extensions = [
# ... other extensions here
'sphinx_search.extension',
]