using database indexing for vsearch

Yes, I ran MetONTIIME which includes vsearch dereplication before classification

echo -e "\nqiime vsearch dereplicate-sequences"
time qiime vsearch dereplicate-sequences \
  --i-sequences sequences.qza \
  --o-dereplicated-table table_tmp.qza \
  --o-dereplicated-sequences rep-seqs_tmp.qza

echo -e "\nqiime vsearch cluster-features-de-novo"
time qiime vsearch cluster-features-de-novo \
  --i-sequences rep-seqs_tmp.qza \
  --i-table table_tmp.qza \
  --p-perc-identity 1 \
  --o-clustered-table table.qza \
  --o-clustered-sequences rep-seqs.qza \
  --p-threads $THREADS
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