[Discover] Improve styling of graphs in sidebar

src/plugins/discover/public/application/components/sidebar/discover_field_bucket.scss

@@ -0,0 +1,4 @@
+.dscFieldDetails__barContainer {
+  // Constrains value to the flex item, and allows for truncation when necessary
+  min-width: 0;
+}

src/plugins/discover/public/application/components/sidebar/discover_field_bucket.tsx

@@ -17,11 +17,12 @@
  * under the License.
  */
 import React from 'react';
-import { EuiButtonIcon, EuiFlexGroup, EuiFlexItem, EuiText } from '@elastic/eui';
+import { EuiText, EuiButtonIcon, EuiFlexGroup, EuiFlexItem, EuiSpacer } from '@elastic/eui';
 import { i18n } from '@kbn/i18n';
 import { StringFieldProgressBar } from './string_progress_bar';
 import { Bucket } from './types';
 import { IndexPatternField } from '../../../../../data/public';
+import './discover_field_bucket.scss';
 
 interface Props {
   bucket: Bucket;
@@ -47,11 +48,25 @@ export function DiscoverFieldBucket({ field, bucket, onAddFilter }: Props) {
 
   return (
     <>
-      <EuiFlexGroup gutterSize="xs" responsive={false}>
-        <EuiFlexItem className="eui-textTruncate">
-          <EuiText size="xs" className="eui-textTruncate">
-            {bucket.display === '' ? emptyTxt : bucket.display}
-          </EuiText>
+      <EuiFlexGroup justifyContent="spaceBetween" responsive={false} gutterSize="s">
+        <EuiFlexItem className="dscFieldDetails__barContainer" grow={1}>
+          <EuiFlexGroup justifyContent="spaceBetween" gutterSize="xs" responsive={false}>
+            <EuiFlexItem grow={1} className="eui-textTruncate">
+              <EuiText size="xs" className="eui-textTruncate">
+                {bucket.display === '' ? emptyTxt : bucket.display}
+              </EuiText>
+            </EuiFlexItem>
+            <EuiFlexItem grow={false} className="eui-textTruncate">
+              <EuiText color="secondary" size="xs" className="eui-textTruncate">
+                {bucket.percent}%
+              </EuiText>
+            </EuiFlexItem>
+          </EuiFlexGroup>
+          <StringFieldProgressBar
+            value={bucket.value}
+            percent={bucket.percent}
+            count={bucket.count}
+          />
         </EuiFlexItem>
         {field.filterable && (
           <EuiFlexItem grow={false}>
@@ -90,7 +105,7 @@ export function DiscoverFieldBucket({ field, bucket, onAddFilter }: Props) {
           </EuiFlexItem>
         )}
       </EuiFlexGroup>
-      <StringFieldProgressBar percent={bucket.percent} count={bucket.count} />
+      <EuiSpacer size="s" />
     </>
   );
 }

src/plugins/discover/public/application/components/sidebar/discover_sidebar.scss

@@ -128,7 +128,6 @@
   display: block;
 }
 
-
 .dscFieldSearch {
   padding: $euiSizeS;
 }

src/plugins/discover/public/application/components/sidebar/string_progress_bar.tsx

@@ -17,35 +17,24 @@
  * under the License.
  */
 import React from 'react';
-import { EuiFlexGroup, EuiFlexItem, EuiProgress, EuiText, EuiToolTip } from '@elastic/eui';
+import { EuiProgress, EuiToolTip } from '@elastic/eui';
 
 interface Props {
   percent: number;
   count: number;
+  value: string;
 }
 
-export function StringFieldProgressBar(props: Props) {
+export function StringFieldProgressBar({ value, percent, count }: Props) {
+  const tooltipContent = `${value} ${count}`;
   return (
     <EuiToolTip
       anchorClassName="dscProgressBarTooltip__anchor"
-      content={props.count}
+      content={tooltipContent}
       delay="regular"
       position="right"
     >
-      <EuiFlexGroup alignItems="center" responsive={false}>
-        <EuiFlexItem>
-          <EuiProgress
-            value={props.percent}
-            max={100}
-            color="secondary"
-            aria-hidden={true}
-            size="l"
-          />
-        </EuiFlexItem>
-        <EuiFlexItem grow={false}>
-          <EuiText size="xs">{props.percent}%</EuiText>
-        </EuiFlexItem>
-      </EuiFlexGroup>
+      <EuiProgress value={percent} max={100} color="secondary" aria-hidden={true} size="s" />
     </EuiToolTip>
   );
 }