CLN: move pandas.indexes -> pandas.core.indexes
xref #13634  

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=h1) Report
> Merging [#16031](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/89bd26871727615aeef63be6243ced4ed5501f26?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16031/graphs/tree.svg?token=eZ4WkYLtcO&src=pr&height=150&width=650)](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #16031      +/-   ##
==========================================
- Coverage   90.99%   90.99%   -0.01%     
==========================================
  Files         153      153              
  Lines       50469    50469              
==========================================
- Hits        45926    45925       -1     
- Misses       4543     4544       +1
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.76% <100%> (-0.01%)` | :arrow_down: |
| #single | `40.43% <96.96%> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/compat/pickle\_compat.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvbXBhdC9waWNrbGVfY29tcGF0LnB5) | `69.51% <ø> (ø)` | :arrow_up: |
| [pandas/core/indexes/frozen.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9mcm96ZW4ucHk=) | `91.17% <ø> (ø)` | |
| [pandas/tseries/period.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL3RzZXJpZXMvcGVyaW9kLnB5) | `92.74% <100%> (ø)` | :arrow_up: |
| [pandas/core/sparse/array.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3BhcnNlL2FycmF5LnB5) | `91.46% <100%> (ø)` | :arrow_up: |
| [pandas/core/indexes/category.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9jYXRlZ29yeS5weQ==) | `98.43% <100%> (ø)` | |
| [pandas/tseries/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL3RzZXJpZXMvYmFzZS5weQ==) | `96.67% <100%> (ø)` | :arrow_up: |
| [pandas/tseries/tdi.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL3RzZXJpZXMvdGRpLnB5) | `90.37% <100%> (ø)` | :arrow_up: |
| [pandas/tseries/index.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL3RzZXJpZXMvaW5kZXgucHk=) | `95.43% <100%> (ø)` | :arrow_up: |
| [pandas/core/index.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXgucHk=) | `100% <100%> (ø)` | :arrow_up: |
| [pandas/core/indexes/multi.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9tdWx0aS5weQ==) | `96.7% <100%> (ø)` | |
| ... and [9 more](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=footer). Last update [89bd268...3259aa2](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=h1) Report
> Merging [#16031](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/89bd26871727615aeef63be6243ced4ed5501f26?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16031/graphs/tree.svg?height=150&width=650&token=eZ4WkYLtcO&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #16031      +/-   ##
==========================================
- Coverage      91%   90.99%   -0.01%     
==========================================
  Files         153      153              
  Lines       50469    50469              
==========================================
- Hits        45927    45925       -2     
- Misses       4542     4544       +2
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.76% <100%> (-0.01%)` | :arrow_down: |
| #single | `40.43% <96.96%> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/indexes/frozen.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9mcm96ZW4ucHk=) | `91.17% <ø> (ø)` | |
| [pandas/compat/pickle\_compat.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvbXBhdC9waWNrbGVfY29tcGF0LnB5) | `69.51% <ø> (ø)` | :arrow_up: |
| [pandas/core/indexes/range.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9yYW5nZS5weQ==) | `92.11% <100%> (ø)` | |
| [pandas/tseries/tdi.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL3RzZXJpZXMvdGRpLnB5) | `90.37% <100%> (ø)` | :arrow_up: |
| [pandas/core/indexes/category.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9jYXRlZ29yeS5weQ==) | `98.43% <100%> (ø)` | |
| [pandas/tseries/period.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL3RzZXJpZXMvcGVyaW9kLnB5) | `92.74% <100%> (ø)` | :arrow_up: |
| [pandas/core/indexes/multi.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9tdWx0aS5weQ==) | `96.7% <100%> (ø)` | |
| [pandas/core/indexes/numeric.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9udW1lcmljLnB5) | `97.1% <100%> (ø)` | |
| [pandas/core/categorical.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY2F0ZWdvcmljYWwucHk=) | `95.85% <100%> (ø)` | :arrow_up: |
| [pandas/core/indexes/api.py](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9hcGkucHk=) | `98.68% <100%> (ø)` | |
| ... and [8 more](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=footer). Last update [89bd268...3259aa2](https://codecov.io/gh/pandas-dev/pandas/pull/16031?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
