InfluxDB 2.x: Map unmapped buckets (DBRP / InfluxDB 1.x compatibility)

If you want to query an InfluxDB 2.x with the query language InfluxQL you have to create a map for your bucket.
In InfluxDB 1.x, data is stored in databases and retention policies. In InfluxDB OSS 2.0, data is stored in buckets. Because InfluxQL uses the 1.x data model, before querying in InfluxQL, a bucket must be mapped to a database and retention policy (DBRP).
If you don't create this mapping, an error will occurs, because influx can't find the database.

curl --request POST http://localhost:80/api/v2/dbrps \
  --header "Authorization: Token <YOUR_TOKEN>" \
  --header 'Content-type: application/json' \
  --data '{
        "bucketID": "<YOUR_BUCKET_ID>",
        "database": "<YOUR_DB_NAME>",
        "default": true,
        "orgID": "<YOUR_ORGANISATION_ID>",
        "retention_policy": "<YOUR_RETENTION_POLICY_FOR_MAPPING>"
      }'

Source: https://docs.influxdata.com/influxdb/v2.0/query-data/influxql/#map-unmapped-buckets