BApp details: ElasticBurp
This extension stores requests and responses from selected Burp tools in an ElasticSearch index including metadata like headers and parameters.
This enables a Burp user to perform extended searches, such as "POST requests where parameter csrftoken is not set" or "Responses with missing header x-content-type-options".
See blog article for further details.
You can install BApps directly within Burp, via the BApp Store feature in the Burp Extender tool. You can also download them from here, for offline installation into Burp.
Please note that extensions are written by third party users of Burp, and PortSwigger Web Security makes no warranty about their quality or usefulness for any particular purpose.