Simplify searchAndIndexShardCountPanel by removing default values

Updated searchAndIndexShardCountPanel (opensearch-mixin/panels.libsonnet:1020-1037):
- Added intervalFactor(2) to the shards_per_index target
- Removed all default values (color mode, axis config, legend, tooltip)
- Kept only meaningful customizations: unit('shards'), thresholds
- Added field override to hide series with all-zero values from legend/tooltip

The panel has been reduced from 37 lines to 17 lines while maintaining
identical functionality to the legacy panel.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: postnati

opensearch-mixin/panels.libsonnet

@@ -1020,40 +1020,20 @@ local utils = commonlib.utils;
       searchAndIndexShardCountPanel:
         g.panel.timeSeries.new('Shard count')
         + g.panel.timeSeries.panelOptions.withDescription('The number of index shards for the selected index.')
-        + g.panel.timeSeries.queryOptions.withTargets([signals.indexing.shards_per_index.asTarget()])
+        + g.panel.timeSeries.queryOptions.withTargets([
+          signals.indexing.shards_per_index.asTarget()
+          + g.query.prometheus.withIntervalFactor(2),
+        ])
         + g.panel.timeSeries.standardOptions.withUnit('shards')
-        + g.panel.timeSeries.standardOptions.color.withMode('palette-classic')
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withAxisCenteredZero(false)
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withAxisColorMode('text')
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withAxisLabel('')
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withAxisPlacement('auto')
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withBarAlignment(0)
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withDrawStyle('line')
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withFillOpacity(0)
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withGradientMode('none')
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withLineInterpolation('linear')
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withLineWidth(1)
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withPointSize(5)
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withScaleDistribution({ type: 'linear' })
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withShowPoints('auto')
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withSpanNulls(false)
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withStacking({ group: 'A', mode: 'none' })
-        + g.panel.timeSeries.fieldConfig.defaults.custom.withThresholdsStyle({ mode: 'off' })
         + g.panel.timeSeries.standardOptions.thresholds.withSteps([
           g.panel.timeSeries.standardOptions.threshold.step.withColor('green')
           + g.panel.timeSeries.standardOptions.threshold.step.withValue(null),
           g.panel.timeSeries.standardOptions.threshold.step.withColor('red')
           + g.panel.timeSeries.standardOptions.threshold.step.withValue(80),
         ])
-        + g.panel.timeSeries.options.withLegend({
-          calcs: [],
-          displayMode: 'list',
-          placement: 'bottom',
-          showLegend: true,
-        })
-        + g.panel.timeSeries.options.withTooltip({
-          mode: 'single',
-          sort: 'none',
-        }),
+        + g.panel.timeSeries.standardOptions.withOverrides([
+          g.panel.timeSeries.fieldOverride.byValue.new({op: 'gte', reducer: 'allIsZero', value: 0})
+          + g.panel.timeSeries.fieldOverride.byValue.withProperty('custom.hideFrom', {legend: true, tooltip: true, viz: false}),
+        ]),
     },
 }