The Block Keys action removes all keys that match a regular expression. When applied to your processing rule, the Block Keys will remove keys that match the regular expression provided.
For example, given the following sample website log data;
To remove page_id key from the log data, from the actions drop down menu of your processing rules tab, select Block_keys. In the regex text box, add “page_id.” Check the Match case button if you want your regular expression to be case-sensitive.
\
Your processing rule will now remove the page_id key from your data in your pipeline.