labeling with maplex label engine 717

Question

https://transparentgov.net:3200/googlemaps717/default?layer_id=8&layer=SCHOOL+DISTRICTS&center_lat=33.63865966961277&center_long=-116.23206344892122&center_zoom=12&url=https%3A%2F%2Fgis.la-quinta.org%2Farcgis%2Frest%2Fservices%2FTrackIt%2FTRACKiT_Data_2016%2FMapServer&overlayType=overlayType_image&panto=0&dynamicLayersString=%5B%7B%22id%22%3A8%2C%22name%22%3A%22SCHOOL+DISTRICTS%22%2C%22source%22%3A%7B%22type%22%3A%22mapLayer%22%2C%22mapLayerId%22%3A8%7D%2C%22drawingInfo%22%3A%7B%22showLabels%22%3Atrue%2C%22labelingInfo%22%3A%5B%7B%22labelExpression%22%3Anull%2C%22labelExpressionInfo%22%3A%7B%22expression%22%3A%22%24feature%5B%5C%22DISTRICT_NAME%5C%22%5D%22%2C%22value%22%3A%22%7BDISTRICT_NAME%7D%22%7D%2C%22useCodedValues%22%3Atrue%2C%22maxScale%22%3A0%2C%22minScale%22%3A0%2C%22where%22%3Anull%2C%22labelPlacement%22%3A%22esriServerPolygonPlacementAlwaysHorizontal%22%2C%22symbol%22%3A%7B%22color%22%3A%5B255%2C0%2C255%2C255%5D%2C%22type%22%3A%22esriTS%22%2C%22backgroundColor%22%3Anull%2C%22borderLineColor%22%3Anull%2C%22haloSize%22%3A3.75%2C%22haloColor%22%3A%5B255%2C255%2C255%2C255%5D%2C%22horizontalAlignment%22%3A%22center%22%2C%22rightToLeft%22%3Afalse%2C%22angle%22%3A0%2C%22xoffset%22%3A0%2C%22yoffset%22%3A0%2C%22text%22%3A%22%22%2C%22rotated%22%3Afalse%2C%22kerning%22%3Atrue%2C%22font%22%3A%7B%22size%22%3A15%2C%22style%22%3A%22normal%22%2C%22decoration%22%3A%22none%22%2C%22weight%22%3A%22bold%22%2C%22family%22%3A%22Arial%22%7D%7D%7D%5D%7D%2C%22minScale%22%3A0%2C%22maxScale%22%3A0%7D%5D

 

 

 

https://transparentgov.net/json2tree/esri/server/folder.html?url=https%3A%2F%2Fgis.la-quinta.org%2Farcgis%2Frest%2Fservices&org=La+Quinta+CA&_center_lat=33.6634&_center_long=-116.31&_center_zoom=17&select_folder=24&select_layer=8