akkoma/lib/pleroma/search/elasticsearch/user_paser.ex

defmodule Pleroma.Search.Elasticsearch.Parsers.User do
  defp to_es(term) when is_binary(term) do
    %{
      bool: %{
        minimum_should_match: 1,
        should: [
          %{
            match: %{
              bio: %{
                query: term,
                operator: "AND"
              }
            }
          },
          %{
            term: %{
              nickname: %{
                value: term
              }
            }
          },
          %{
            match: %{
              display_name: %{
                query: term,
                operator: "AND"
              }
            }  
          }
        ]
      }
    }
  end

  defp to_es({:quoted, term}), do: to_es(term)

  defp to_es({:filter, ["user", query]}) do
    %{
      term: %{
        nickname: %{
          value: query
        }
      }
    }
  end

  defp to_es({:filter, _}), do: nil

  def parse(q) do
    Enum.map(q, &to_es/1)
    |> Enum.filter(fn x -> x != nil end)
  end
end