Fix DistributionNotFound error argparse>=1.1.0 in elasticsearch-curator installation

I wanted to install elasticsearch-curator package(ver. 2.0.2) on my CentOS machine to manage my old elasticsearch(ver. 1.2.0) indices. I encountered the following weird error while installing:

$ curator --versionTraceback (most recent call last):  File "/usr/bin/curator", line 5, in <module>    from pkg_resources import load_entry_point  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 2655, in <module>    working_set.require(__requires__)  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 648, in require    needed = self.resolve(parse_requirements(requirements))  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 546, in resolve    raise DistributionNotFound(req)pkg_resources.DistributionNotFound: argparse>=1.1.0

After searching on google, it became apparent that the error is peculiar to CentOS/RHEL variants only!!

Finally, I found a way..... Un-install existing installation and then re-install...

$ sudo pip uninstall argparse
$ sudo pip uninstall elasticsearch
$ sudo pip uninstall elasticsearch-curator
$ sudo pip install argparse
$ sudo pip install elasticsearch
$ sudo pip install elasticsearch-curator

Not a perfect way to solve the issue... But still, the
This thread on github might be useful - https://github.com/elasticsearch/curator/issues/56

I found another reason for this type of error: it happens when the version of setuptools and distribute libraries of python on the system are old. So, update them using pip installer:

$ sudo pip install distribute --upgrade
$ sudo pip install setuptools --upgrade