Simple script that queries OpenSearch logs and exports them to CSV or JSON.

python -m venv .venv

.venv\Scripts\activate

python -r pip install ./requirements.txt
or
pip install -r requirements.txt

The script connects to an OpenSearch cluster using the credentials and connection details provided in parameters.json. It then executes a query based on the configuration in the same file, fetching data within a specified time range and matching defined criteria. The results are streamed and saved to either a JSON or CSV file, as configured.

The parameters.json file contains all the necessary settings for the script to run. Here's a breakdown of the main sections:

• connection: Specifies the OpenSearch host, port, username, password, and SSL settings.
• index: The index pattern to query (e.g., your-index-pattern-*).
• timespan: Defines the start and end time for the data query in YYYY-MM-DDTHH:mm:ss format.
• query: Contains the specific query details (see below).
• output: Configures the output format (json or csv), file path, and batch size for fetching data.
• scroll: Sets the scroll time for fetching large datasets.

The query object within parameters.json allows you to specify the search criteria using the OpenSearch Query DSL.

• _source: (Optional) A list of fields to include in the results. If omitted, all fields are returned.
• bool_conditions: (Optional) Defines boolean clauses (must, should, must_not, filter) to combine multiple query criteria. You can nest boolean queries and use various query types like term, match, range, wildcard, exists, etc.

Example Query Structure:

"query": {
  "_source": [
    "timestamp",
    "applicationName",
    "fields.eventCode"
  ],
  "bool_conditions": {
    "must": [
      {
        "bool": {
          "should": [
            {
              "bool": {
                "must": [
                  {"wildcard": {"applicationName": "app-prefix*"}},
                  {"term": {"fields.eventCode.keyword": "EVENT_CODE_1"}}
                ]
              }
            },
            {
              "bool": {
                "must": [
                  {"wildcard": {"applicationName": "another-app-prefix*"}},
                  {"exists": {"field": "fields.correlationId"}}
                ]
              }
            }
          ],
          "minimum_should_match": 1
        }
      }
    ]
  }
}

This example fetches specific fields (_source) for documents where the applicationName starts with app-prefix* AND has EVENT_CODE_1, OR where the applicationName starts with another-app-prefix* AND the fields.correlationId exists.

Once configured, run the script from your activated virtual environment:

python fetchData.py

You can optionally provide a path to a different configuration file:

python fetchData.py /path/to/your/custom_parameters.json