Begin by exporting your data from Notion. Open the Notion page you want to export, click on the "..." menu in the top right corner, and select "Export." Choose the format you prefer, such as Markdown, CSV, or HTML. Save the exported file to a location you can easily access. Note that the CSV format is typically easiest to work with for data manipulation.

Once you've exported the data, you'll need to format it for Elasticsearch. If you've chosen CSV, convert it to JSON format since Elasticsearch primarily accepts JSON documents. Use a scripting language like Python to read the CSV file and convert each row into a JSON object. Ensure your JSON objects are structured in a way that suits your Elasticsearch index mapping.

Ensure you have Elasticsearch set up and running. If you haven't already installed it, download the appropriate version of Elasticsearch from the official website and follow the installation instructions for your operating system. Start the Elasticsearch service and confirm it's running by accessing `http://localhost:9200` in your web browser.

Before importing your data, create an index in Elasticsearch where your data will reside. Use the Elasticsearch API to define the index and its mappings. You can do this via a tool like Kibana or with a command-line tool like `curl`. For example, to create an index named "notion_data", you might use:
```bash
curl -X PUT "localhost:9200/notion_data" -H 'Content-Type: application/json' -d'
{
"mappings": {
"properties": {
"field1": { "type": "text" },
"field2": { "type": "keyword" },
"dateField": { "type": "date" }
}
}
}
'
```

Create a script to read your JSON data and push it to Elasticsearch. Use a language like Python with the `requests` library to send HTTP requests to the Elasticsearch server. Loop through each JSON object and post it to the designated index using the Elasticsearch bulk API for efficiency. Here's a simple example:
```python
import json
import requests
with open('data.json') as f:
data = json.load(f)
headers = {'Content-Type': 'application/json'}
bulk_data = ''
for record in data:
bulk_data += json.dumps({'index': {}}) + '\n'
bulk_data += json.dumps(record) + '\n'
response = requests.post('http://localhost:9200/notion_data/_bulk', headers=headers, data=bulk_data)
print(response.json())
```

After running your import script, verify that the data has been successfully imported into Elasticsearch. You can do this by querying the index using the Elasticsearch API or a tool like Kibana. For example, you can use:
```bash
curl -X GET "localhost:9200/notion_data/_search" -H 'Content-Type: application/json' -d'
{
"query": {
"match_all": {}
}
}
'
```
Check the response to ensure all expected records are present.

Once your data is in Elasticsearch, regularly monitor the index to ensure its health and performance. Use Elasticsearch's monitoring tools to keep track of index size, document count, and any potential errors. Set up automated scripts or alerts for any anomalies, and periodically optimize your index settings based on usage patterns to maintain performance.