Merge pull request #288309 from v-aljagtap/v-aljagtap/128511

FAQ added into FHIR search overview page in AHDS

Author: prmerger-automator[bot]

articles/healthcare-apis/fhir/overview-of-search.md

@@ -160,6 +160,14 @@ As previously mentioned, the results from a FHIR search are available in paginat
 
 Currently, the FHIR service in Azure Health Data Services only supports the `next` link and doesn’t support `first`, `last`, or `previous` links in bundles returned from a search.
 
+## FAQ
+
+What does "partial support" mean in
+[R4 Unsupported Search Parameters](https://github.com/microsoft/fhir-server/blob/main/src/Microsoft.Health.Fhir.Core/Data/R4/unsupported-search-parameters.json)?
+
+Some of the resource-specific search parameters cover more than one data type, and the FHIR service in Azure Health Data Services may only support that search parameter on one of those data types. For example, Condition-abatement-age and Condition-onset-age cover two different data types, Age and Range; however, the FHIR service in Azure Health Data Services supports those two search parameters on Range, but not on Age.
+
+
 ## Next steps
 
 Now that you've learned about the basics of FHIR search, see the search samples page for details about how to search using search parameters, modifiers, and other FHIR search methods.