Entering text in the Advanced Settings search bar that isn't valid AST causes page to crash

[peteharverson]

Kibana version: 6.5.0

If text is entered into the search bar in the Advanced Settings page under the Management tab that isn't valid AST, the page crashes.

For example type in ? into the search bar on the page:

causes:

[elasticmachine]

Pinging @elastic/kibana-management

[cjcenizal]

On the EuiSearchBar example the error is handled like this:

  onChange = ({ query, error }) => {
    if (error) {
      this.setState({ error });
    } else {
      this.setState({
        error: null,
        result: EuiSearchBar.Query.execute(query, items, { defaultFields: ['owner', 'tag', 'type'] }),
        query
      });
    }
  };

[nreese]

@cjcenizal Same thing happens on the saved object management page if you enter ? in the search box

[cjcenizal]

For further context, the original bug reported was introduced in 6.4 (#17465) and the saved objects bug was also introduced in 6.4 (#17426)