Return docs selected using the maximal marginal relevance.
Maximal marginal relevance optimizes for similarity to query AND diversity among selected documents.
Returns:
List of Document objects selected by maximal marginal relevance.
Number between 0 and 1 that determines the degree of
diversity among the results with 0 corresponding to maximum diversity
and 1 to minimum diversity.
Filter on metadata properties, e.g.
{
"str_property": "foo",
"int_property": 123
}