Add record set sort fields for period of time.

src/main/kotlin/ch/memobase/RecordSetSearchDocBuilder.kt

@@ -175,6 +175,8 @@ class RecordSetSearchDocBuilder(private val elasticSearchWrapper: ElasticSearchW
                 }
             },
             periodOfTimeAsYear = date,
+            periodOfTimeAsYearFrom = date?.lte.toString(),
+            periodOfTimeAsYearTo = date?.gte.toString(),
             institution = institutionIds.map { elasticSearchWrapper.getInstitutionName(it) },
             supportedByMemoriav = recordSet[Constants.sponsoredBy] != null,
             name = name,

src/main/kotlin/ch/memobase/model/RecordSetSearchDoc.kt

@@ -37,6 +37,8 @@ data class RecordSetSearchDoc(
     // Facets
     val documentType: List<FacetContainer>,
     val periodOfTimeAsYear: IntegerRange?,
+    val periodOfTimeAsYearFrom: String?,
+    val periodOfTimeAsYearTo: String?,
     val supportedByMemoriav: Boolean,
     val languageOfMetadata: List<FacetContainer>,
     val institution: List<FacetContainer>,
@@ -94,6 +96,8 @@ data class RecordSetSearchDoc(
             ),
             institution = emptyList(),
             periodOfTimeAsYear = IntegerRange(2000, 2020),
+            periodOfTimeAsYearFrom = "2000",
+            periodOfTimeAsYearTo = "2020",
             lastUpdatedDate = "2020-11-20T10:29:01.128",
             keyVisualLink = "https://mb-wf1.memobase.unibas.ch/sites/default/files/styles/teaser/public/2020-10/1.jpg?itok=5ncVBnVQ",
             numberOfDocuments = 100,

src/test/resources/data/recordSets/testAddingInstitutionUpdateOutput.json

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\ No newline at end of file
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\ No newline at end of file