from long to tlong, compatible?

[Dan G]

Hi, 


I'm using SOLR 1.4.1 and have a rather large index with 800+M docs. 
Until now we have, erroneously I think, indexed a long field with the type:

<fieldType name="long" class="solr.TrieLongField" precisionStep="0" 
omitNorms="true" positionIncrementGap="0"/>

Now the range queries have become slow as there are many distinct terms in the 
index. 


My question is if it would be possible to just change the field to the 
preferred 

type "tlong" with a precision of "8"?

<fieldType name="tlong" class="solr.TrieLongField" precisionStep="8" 
omitNorms="true" positionIncrementGap="0"/>

Would this change be compatible with my indexed data or should I re-indexed the 
date (a pain with 800+M docs :))?

Thanks
/dise