Splunk search for Indexes that are more than 75% full
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| rest /services/data/indexes-extended
| table title currentDBSizeMB maxTotalDataSizeMB
| eval perc_full=round(currentDBSizeMB/maxTotalDataSizeMB*100, 2) | search perc_full>=75
This search will find any indexes that are currently greater than or equal to 75% of their maxTotalDataSizeMB. This search could easily be modified to show indexes that are using a very small percentage of their allowable size by changing the final search command (search perc_ful>=75).