How to overcome missing language analyzers?

What is the general approach/best practice when an analyzer is missing? We need to provide support for functionalities like stemming and there is a range of languages missing.
I suppose this should be a common issue and despite we have found some plugins, they do not suffice. Should we consider implementing them somehow or there is some open/commercial support which can on demand provide plugins for missing analyzers?

Language analysers missing:
Eesti keel (et)- Estonian,
Hrvatski (hr)- Croatian,
Malti (mt) – Maltese,
Nederlands (nl) – Netherlands,
Polski (pl) – Polish,
Slovenčina (sk) – Slovak,
Slovenščina (sl) – slovenian

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