DOC indexing: Google search for 'pandas greater than' returns `pandas.DataFrame.ge` as #1, and `pandas.DataFrame.gt`/`pandas.Series.gt` aren't even found
#### Problem description

(I'm aware that Google SEO is not under pandas' control. However this one's quite important, and nowhere in the pandas doc does it actually tell us where/how to report SEO fails, if at all. So please tell us how and where to report things like this. Are all pandas doc pages automatically submitted to be crawled by Google?)

The indexing of pandas DataFrame/Series operators seems to have some holes:

A Google search for *'pandas greater than'* returns ['pandas.DataFrame.ge'](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.ge.html) as #1, and `pandas.DataFrame.gt`/`pandas.Series.gt` aren't even found, let alone in the top 10.

1. The #1 hit should be `pandas.DataFrame.gt`
1. `pandas.Series.gt` should also be found, #2, but they're not. Similarly #3 `pandas.Series.between`, `pandas.Series.ge` etc.

A Google search for *'pandas less than'* is slightly better:
1. #1 hit is `pandas.DataFrame.le` (pandas 1.0.1 doc)
1. #2 hit is `pandas.Series.le` (pandas 1.0.1 doc)
1. #3 hit is `pandas.Series.between` (pandas 0.23.1 doc(?), not 1.0.x)
1. The #1 and #2 hits should be `pandas.DataFrame.lt`/`pandas.Series.lt`

#### Expected Output

as above