Reindexing to alias is not always easy if it requires 2x resources. Just to be clear the issues you mentioned are mostly around faceting because we haven't seen any other search/retrieval issues. Or is that not accurate?
On Wed, May 22, 2019 at 5:12 PM Erick Erickson <erickerick...@gmail.com> wrote: > 1> I strongly recommend you re-index into a new collection and switch to > it with a collection alias rather than try to re-index all the docs. > Segment merging with the same field with dissimilar definitions is not > guaranteed to do the right thing. > > 2> No. There a few (very few) things that don’t require starting fresh. > You can do some things like add a lowercasefilter, add or remove a field > totally and the like. Even then you’ll go through a period of mixed-up > results until the reindex is complete. But changing the type, changing from > multiValued to singleValued or vice versa (particularly with docValues) > etc. are all “fraught”. > > My usual reply is “if you’re going to reindex everything anyway, why not > just do it to a new collection and alias when you’re done?” It’s much safer. > > Best, > Erick > > > On May 22, 2019, at 3:06 PM, John Davis <johndavis925...@gmail.com> > wrote: > > > > Hi there - > > Our facet counts are incorrect for a particular field and I suspect it is > > because we changed the type of the field from StrField to TextField. Two > > questions: > > > > 1. If we do re-index all the documents in the index, would these counts > get > > fixed? > > 2. Is there a "safe" way of changing field types that generally works? > > > > *Old type:* > > <fieldType name="strings" class="solr.StrField" sortMissingLast="true" > > docValues="true" multiValued="true"/> > > > > *New type:* > > <fieldType name="lowercase_notokenize" class="solr.TextField" > > omitNorms="true" omitTermFreqAndPositions="true" indexed="true" > > stored="true" positionIncrementGap="100" sortMissingLast="true" > > multiValued="true"> > > <analyzer> > > <tokenizer class="solr.KeywordTokenizerFactory"/> > > <filter class="solr.LowerCaseFilterFactory"/> > > </analyzer> > > </fieldType> > >
