I guess there are a couple of things to try. Firstly, depending on your searches, you may or may not use double quotes around index names, so trim those. Secondly, again depending on your searches, you may be searching more than one index, so use max_match=0. Finally, title is returned by saved/searches so you should probably override that with the index name found. | rest /services/data/indexes
| fields title
| dedup title
| append [
| rest /servicesNS/-/-/saved/searches
| rex field=search max_match=0 "index=(?P<searchindex>[^\s]+)"
| eval title=trim(searchindex,"\"")
| stats count by title
]
| stats values(*) as * by title
| where isnull(count)
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