The web map search bar in ArcGIS Online and Portal for ArcGIS are unable to search attributes by field if a WGS84 layer is published through a Hebrew locale machine. This is a locale related bug and also occurs in Portal for ArcGIS.
This defect is being closed as non-reproducible as the steps/data needed to reproduce the issue are no longer available. If you have a reproducible case, on a supported configuration, please contact Esri to reopen this defect.
解决办法
Republished the same layer after switching the machine locale to English (United States) instead of Hebrew (Israel).
Modify the web map to contain the old and new feature layers.
Enable Search By Layer on both of the layers. The new feature layer does not have the search issue, unlike the previous layer.