The query field, q, is used to query your ledger data. The query field is required in all search request payloads that you send to the search endpoint. When providing a search term to query, use the query_by to specify what field(s) it should search from. See example below: 
{
    "q": "bln_0be360ca-86fe-457d-be43-daa3f966d8f0",
    "query_by": "source"
}
The above request will return results where the specified balance_id is in the source field. To query by more fields, use commas to separate the fields you want to search in. See example below: 
{
    "q": "bln_0be360ca-86fe-457d-be43-daa3f966d8f0",
    "query_by": "source,destination"
}
To return all documents in the collection without searching for a specific query text, you can use * as the query field’s value.
Request
{
    "q": "*"
}

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