How to index arbitrary headers?

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+Subject: How to index arbitrary headers?\r
+From: Petri Savolainen <petri@koodaamo.fi>\r
+To: notmuch@notmuchmail.org\r
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+\r
+Hello,\r
+\r
+I could not find information anywhere in notmuch docs about what is\r
+actually indexed - specifically, what email headers are indexed and\r
+searchable? If a header is not indexed, does searching for its value still\r
+result in a search hit?\r
+\r
+It would be nice if one could just provide the list of headers to be\r
+indexed in some configuration file or something.\r
+\r
+Thanks,\r
+\r
+ Petri\r
+\r
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+\r
+Hello,<div><br></div><div>I could not find information anywhere in notmuch =\r
+docs about what is actually indexed - specifically, what email headers are =\r
+indexed and searchable? If a header is not indexed, does searching for its =\r
+value still result in a search hit?</div>\r
+<div><br></div><div>It would be nice if one could just provide the list of =\r
+headers to be indexed in some configuration file or something.</div><div><b=\r
+r></div><div>Thanks,</div><div><br></div><div>=A0Petri</div>\r
+\r
+--f46d042dfe9980c9d104cafeb24e--\r