8.1.3: sphinx warnings `reference target not found`

On building my packages I'm using sphinx-build command with -n switch which shows warmings about missing references. These are not critical issues.

First of all it is not possible now use straight sphinx-build.

+ /usr/bin/sphinx-build -n -T -b man docs/sphinx build/sphinx/man
Running Sphinx v4.5.0

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/sphinx/config.py", line 332, in eval_config_file
    exec(code, namespace)
  File "/home/tkloczko/rpmbuild/BUILD/elasticsearch-py-8.1.3/docs/sphinx/conf.py", line 22, in <module>
    import elasticsearch
ModuleNotFoundError: No module named 'elasticsearch'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/sphinx/cmd/build.py", line 272, in build_main
    app = Sphinx(args.sourcedir, args.confdir, args.outputdir,
  File "/usr/lib/python3.8/site-packages/sphinx/application.py", line 202, in __init__
    self.config = Config.read(self.confdir, confoverrides or {}, self.tags)
  File "/usr/lib/python3.8/site-packages/sphinx/config.py", line 165, in read
    namespace = eval_config_file(filename, tags)
  File "/usr/lib/python3.8/site-packages/sphinx/config.py", line 345, in eval_config_file
    raise ConfigError(msg % traceback.format_exc()) from exc
sphinx.errors.ConfigError: There is a programmable error in your configuration file:

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/sphinx/config.py", line 332, in eval_config_file
    exec(code, namespace)
  File "/home/tkloczko/rpmbuild/BUILD/elasticsearch-py-8.1.3/docs/sphinx/conf.py", line 22, in <module>
    import elasticsearch
ModuleNotFoundError: No module named 'elasticsearch'


Configuration error:
There is a programmable error in your configuration file:

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/sphinx/config.py", line 332, in eval_config_file
    exec(code, namespace)
  File "/home/tkloczko/rpmbuild/BUILD/elasticsearch-py-8.1.3/docs/sphinx/conf.py", line 22, in <module>
    import elasticsearch
ModuleNotFoundError: No module named 'elasticsearch'

This can be fixed by use approach which is mentioned in sphisnx dosumentation https://www.sphinx-doc.org/en/master/usage/configuration.html#example-of-configuration-file

--- a/docs/sphinx/conf.py~      2022-04-26 19:26:16.000000000 +0000
+++ b/docs/sphinx/conf.py       2022-04-26 19:27:32.708018028 +0000
@@ -18,6 +18,8 @@

 import datetime
 import os
+import sys
+sys.path.insert(0, os.path.abspath('../..'))

 import elasticsearch

With that patch socumemtation will be always generated out os the module code from source tree.