Series methods `isna()`, `isnull()`, `notna()`, `notnull()` are returning ES query, rather than results.
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topic:dataframe
topic:series
- Dominant language
- Python
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Description
Examples:
```bash
>>> ed_ecommerce["geoip.region_name"].isna()
{'bool': {'must_not': {'exists': {'field': 'geoip.region_name'}}}}
>>> ed_ecommerce["geoip.region_name"].isnull()
{'bool': {'must_not': {'exists': {'field': 'geoip.region_name'}}}}
>>> ed_ecommerce["geoip.region_name"].notna()
{'exists': {'field': 'geoip.region_name'}}
>>> ed_ecommerce["geoip.region_name"].notnull()
{'exists': {'field': 'geoip.region_name'}}
```
See [Pandas Series.isna()](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.isna.html)
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