samtools task remove thread

tasks/samtools.wdl

@@ -11,8 +11,8 @@ task samtools {
     nt=$(nproc)
     mkdir -p /cromwell_root/tmp/samtools
     cd /cromwell_root/tmp/samtools
-    /opt/conda/bin/samtools -@ $nt index ${sep=' ' tumor_bam}
-    /opt/conda/bin/samtools -@ $nt index ${sep=' ' normal_bam}
+    /opt/conda/bin/samtools index ${sep=' ' tumor_bam}
+    /opt/conda/bin/samtools index ${sep=' ' normal_bam}
   >>>
 
   runtime {