fix elasticsearch errors being mistaken for graphql errors #1090
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Elasticsearch records its index path and attaches it to errors. Its useful, but sadly that
pathproperty means that graphql-js assumes that an elasticsearch error is a GraphQLError, and so the index path gets leaked instead of the useful graphql query path.The fix is to be a little bit stricter.
There is probably a better fix to recognise a GraphQLError across contexts, but this will at least improve the situation. Plus, the added tests should make any better solution easier to test.