Introspection queries stop working after a subgraph has encountered an indexing error

[fubhy]

Do you want to request a feature or report a bug?
bug

What is the current behavior?
Introspection queries fail after a subgraph has encountered an indexing error.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem.
This potentially also happens if the subgraph flat fails (not sure) but we encountered it whilst using the nonFatalErrors feature. Hence:

1. Deploy a failing subgraph using the nonFatalErrors feature
2. Wait for it to fail and then try to run a schema introspection or type query
3. The query returns message: indexing_error

What is the expected behavior?
Even if a subgraph has failed, introspection queries should always work (both when using the nonFatalErrors feature or not). The schema is immutable and not affected by any indexing errors.

The __schema and __type fields are part of the spec and used by various tooling. Hence, adding a subgraphErrors: allow input field to those fields wouldn't work well. Instead, both __type and __schema should simply always work.

[mshakeg]

Hi @leoyvens , would it be possible to get this addressed? This issue has been open for quite a while now.