Unexpected 404s from Drugs@FDA API lookups

[jsstevenson]

This url gives a 404: https://api.fda.gov/drug/drugsfda.json?search=openfda.application_number:ANDA090610

but... a drugs@fda record exists for it: https://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&ApplNo=090610

similarly:

• https://api.fda.gov/drug/drugsfda.json?search=openfda.application_number:NDA213973
• https://api.fda.gov/drug/drugsfda.json?search=openfda.application_number:ANDA207228
• https://api.fda.gov/drug/drugsfda.json?search=openfda.application_number:ANDA076898
• https://api.fda.gov/drug/drugsfda.json?search=openfda.application_number:ANDA200483