Correction:
shard.qt is sufficient, but you cannot define only spellcheck component in
requestHandler as it doesn't create shard requests, seems like 'query'
handler is a must if you want distributed processing.
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http://lucene.472066.n3.nabble.com/ShardHandler-di
The only way I succeeded to forward to the right request handler was:
1. shard.qt = /suggest (shards.qt=%2Fsuggest actually) in query
2.handleSelect='true' in solrconfig
3. NO /select handler in solrconfig
Only this combination forces 2 things - shard handler forwards qt=/suggest
parameter to othe