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I'm getting an error when I try to search for `DATA_PROCESS_INSTANCE` using `search` or `searchAcrossEntities` with GraphQL. The error message is:
```[ForkJoinPool.commonPool-worker-11] ERROR c.l.d.g.e.DataHubDataFetcherExceptionHandler:21 - Failed to execute DataFetcher
java.lang.IllegalArgumentException: Unknown entity type: DATA_PROCESS_INSTANCE ```
Are all the `EntityTypes` meant to be searchable? I am also seeing some other entities giving similar errors.

I was expecting that all of these `EntityTypes` would be searchable

and I do have instances of these entities in my db

<@U03MF8MU5P0> can potentially speak to this!

The searchable entity types are enumerated <https://github.com/datahub-project/datahub/blob/43deb7080af17486f66a7b1249af17035e595494/datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/resolvers/search/SearchUtils.java#L15|here>, the data process instance is not in this list. Please feel free to add a <https://feature-requests.datahubproject.io/|feature request>. Thanks!