I am looking for a method that is if given a node n1, can answer the
query if n1 has a relationship of type t with node n2, something along
the lines of:

boolean b = n1.hasRelatioship(n2,t);

I know we can answer this question by iterating over n1's
getRelationships() and testing them. However, I was looking for
something more efficient that does not have to iterate over the node's
relationships, especially that I noticed that the RelationshipIndex
interface has a get() method that does something like that; however we
have to supply it with a key and a value for an attribute for the edge
between the two nodes. So I was looking for something like this
method, but without having to pass a key/value pair.
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