I've just added a 3rd index directory (i.e. 3rd IndexSearcher) to my MultiSearcher and I'm getting BooleanQuery.TooManyClauses errors on queries which were working happily on 2 indexes.
Here's an example query, which hopefully you'll find self-explanatory from
the XML structure.
--------8<--------
<composite-query analyzer='1'>
<group required="true" prohibited="false">
<group required="false" prohibited="false">
<prefix field="to" required="false"
prohibited="false">james</prefix>
<prefix field="cc" required="false"
prohibited="false">james</prefix>
<prefix field="smtp-rcptto" required="false"
prohibited="false">james</prefix>
<prefix field="from" required="false"
prohibited="false">james</prefix>
<prefix field="smtp-mailfrom" required="false"
prohibited="false">james</prefix>
</group>
<parse field="body" required="false"
prohibited="false">james</parse>
<parse field="subject" required="false"
prohibited="false">james</parse>
</group>
</composite-query>
--------8<--------
Note that there isn't even a range in there.
Do BooleanQueries not scale well across indexes?
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