[Maps] Mapbox console error

[thomasneirynck]

Sometimes the following error gets logged to the console when adding layers to the Map

mapbox-gl-csp.js:1 Error: layers.f68ef37a-1d91-400d-bb43-f18b0589e348_circle.paint.circle-radius[5]: Input/output pairs for "interpolate" expressions must be arranged with input values in strictly ascending order.
    at qi (mapbox-gl-csp.js:1)
    at e._validate (mapbox-gl-csp.js:1)
    at e.setPaintProperty (mapbox-gl-csp.js:1)
    at e.setPaintProperty (mapbox-gl-csp.js:1)
    at r.setPaintProperty (mapbox-gl-csp.js:1)
    at DynamicSizeProperty.syncCircleRadiusWithMb (dynamic_size_property.js:117)
    at VectorStyle.setMBPaintPropertiesForPoints (vector_style.js:619)
    at VectorLayer._setMbCircleProperties (vector_layer.js:1310)
    at VectorLayer._setMbPointsProperties (vector_layer.js:1240)
    at VectorLayer._syncStylePropertiesWithMb (vector_layer.js:1427)

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[thomasneirynck]

This occurs when min-max for size expressions is identical. It should not create an interpolate expression.

e.g.

[
	"interpolate",
	[
		"linear"
	],
	[
		"coalesce",
		[
			"case",
			[
				"==",
				[
					"feature-state",
					"doc_count"
				],
				null
			],
			0,
			[
				"max",
				[
					"min",
					[
						"to-number",
						[
							"feature-state",
							"doc_count"
						]
					],
					1
				],
				1
			]
		],
		0
	],
	1,
	1,
	1,
	8
]

The min-max at the end is 1, but tries to interpolate between 1 and 8 pixels. This needs to be corrected.