I have double ups in my search results, how do I clear my index and start again?

It should be as simple as running rebuild_zebra.pl with the -r switch. But if this doesn’t work you can drop and recreate the zebra indexes. To do so for the biblios index.
As the user your zebra runs as (probably koha)
run
zebraidx -c /path/to/zebra-biblios.cfg drop biblios

For me that is
zebraidx -c /home/chris/koha-dev/etc/zebradb/zebra-biblios.cfg drop biblios

Then
zebraidx -c /path/to/zebra-biblios.cfg commit

Then you can run rebuild_zebra.pl -b -r -v

Posted in: Searching
https://koha-community.org/faqs/double-ups-search-results-clear-index-start-again/
koha-community.org
crawl=CC-MAIN-2020-24
42788
application/http; msgtype=response
sha1:ZZXWP5BVQMUTNCG3WBDDNQ62NYXRKHRY
<urn:uuid:d2b0c03b-fa03-486a-9b56-3ae9d9a5af72>
2020-06-03T08:32:56Z
178.79.134.89
text/html
sha1:VMWBTF3KLNXAD2NUMD5UR3BDS4Z7PEKK
<urn:uuid:678287bf-30e5-4bc8-988f-66285f6ecea3>
https://koha-community.org/faqs/double-ups-search-results-clear-index-start-again/
response
<urn:uuid:81c01b07-22e9-4751-b3d6-6d47d97eb621>
isPartOf: CC-MAIN-2020-24
publisher: Common Crawl
description: Wide crawl of the web for May/June 2020
operator: Common Crawl Admin (info@commoncrawl.org)
hostname: ip-10-67-67-117.ec2.internal
software: Apache Nutch 1.16 (modified, https://github.com/commoncrawl/nutch/)
robots: checked via crawler-commons 1.1-SNAPSHOT (https://github.com/crawler-commons/crawler-commons)
format: WARC File Format 1.1
conformsTo: http://iipc.github.io/warc-specifications/specifications/warc-format/warc-1.1/