I should add that when i remove the following part from init.js then the mongodb container starts without a problem.

db.personen.createSearchIndex(
    "testSearchIndex",
    { mappings: { dynamic: true } }
);

After the mongodb container is running I can add a search index over curl for example:

mongosh mongodb://localhost:27017/test --eval "db.personen.createSearchIndex('testSearchIndex', {'mappings':{'dynamic': true}})"

But why can’t I add the search index create into the init.js? What is the error message telling me?