Disable realtimeIndexing

[paavo]

I thought, if i disable realtimeIndexing in Flowpack.ElasticSearch nothing should be indexed while publishing a change.
But i get an Error while publishing a content-change: Elastic-Server can't be reached.

How do i disable ElasticSearch Indexing on my local environment without a ES-Server?

Flowpack:
  ElasticSearch:
    realtimeIndexing:
      enabled: false

Im using Flowpack.ElasticSearch.ContentRepositoryAdaptor but i didn't found any option there.

Neos: 5.3
"flowpack/elasticsearch-contentrepositoryadaptor": "^7",