[BUG] Support filter type "query_string" on saved search

[zhongnansu]

Describe the bug
Coming from #92
in Disvoer it maps to the feature "Edit as DSL" in filter box

To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Plugins
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Host/Environment (please complete the following information):

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• Version [e.g. 22]

Additional context
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