Begin by exporting your Google Sheets data to a CSV file. Open your Google Sheet, click on "File" in the menu, select "Download," and choose "Comma-separated values (.csv, current sheet)." This will download the currently active sheet as a CSV file to your computer.

Install Python on your computer if it's not already installed. You can download it from the [official website](https://www.python.org/downloads/). Once installed, set up a virtual environment using `venv` to manage dependencies cleanly. Use the command `python -m venv myenv` to create a virtual environment named `myenv`.

Activate your virtual environment with `source myenv/bin/activate` (on macOS/Linux) or `myenv\Scripts\activate` (on Windows). Install the required libraries using pip: `pip install pandas elasticsearch`. Pandas will help in processing the CSV data, and the Elasticsearch library will facilitate interaction with the Elasticsearch cluster.

Use Pandas to read the CSV file into a DataFrame. Create a Python script and import Pandas:
```python
import pandas as pd
df = pd.read_csv('path_to_your_file.csv')
```
This will load your CSV data into a DataFrame for easier manipulation.

Convert the DataFrame into a JSON format compatible with Elasticsearch. You can achieve this by iterating over the DataFrame and preparing each row as a JSON document:
```python
records = df.to_dict(orient='records')
```

Initialize the Elasticsearch client in your script. Import the `Elasticsearch` module and set up the client:
```python
from elasticsearch import Elasticsearch
es = Elasticsearch([{'host': 'localhost', 'port': 9200}])
```
Replace `'localhost'` and `9200` with your Elasticsearch server's address and port if they are different.

Loop through the JSON records and index each one into your chosen Elasticsearch index:
```python
for record in records:
es.index(index='your_index_name', document=record)
```
Replace `'your_index_name'` with the name of your Elasticsearch index. This process will insert each document into Elasticsearch.

By following these steps, you can successfully move data from Google Sheets to Elasticsearch without relying on third-party connectors or integrations. Adjust paths, index names, and configurations as needed for your specific setup.