[Lens][Formatters] Always show missing values instead of nulls

[markov00]

Summary

Close #221155

This PR aligns the formatting for string and numbers when values are null or empty strings.

There where many different places and different formatting logic for these situations, that changes depending on the consumer: many different labels where used in place of these 2 values, like (missing value),Missing, -, -. Same for the empty that sometime it was (empty) and other was just an empty string.

There was also some different displaying logic in charts where the null values where removed from the chart (specially for ESQL).

This PR aligns also the behavior across Discover and Lens when rendering table and across DSL and ESQL, by removing every possible custom behaviour of null/empty handling and moving the handling directly in the formatters.

New labels replacements for null and empty string:

The current alignments are:

• for null/missing bucket/values -> use the label (null)
• for empty string -> use the label (blank)
• for NaN numbers -> use the term NaN

As discussed with the various teams and PMs, we agreed on (null) and (blank) as stated above.
These labels are shorter, understandable (null is aligned with the actual data status, blank instead refers to the absence of text, so an empty string).
The use of the parenthesis is required to improve the readablinty of these values in charts to avoid confusion with other actual labels.

There can be alternatives, but needs to be evaluated with PMs and the Docs team:
- NULL and EMPTY was suggested by the Docs team
- (Missing) and (Blank) are personally suggested by the PR author
The choice really depends on the type of user we are targeting, NULL/EMPTY is more database/SQL oriented where missing/blank is more business oriented.
I also consider blank a better term then empty that could be interpteted as void/missing, where blank instead is related to a string/term rather then a bucket/number.

I also fixed the html conversions, used in tables, to correctly output the styled values.

Changes screenshots

**The below screenshot are outdated, you should consider that instead of (missing value) we are not showing (null) and instead of (empty) we are not showing (blank).

Lens Tables: categorical values

Now DSL and ESQL tables reflects the same labels for null/empty.
The DSL missing value now also uses a specific HTML style

Screenshots

BEFORE:

AFTER:

Lens Tables: numerical breakdown

No major change for DSL charts (is not possible to show missing values when aggregating by terms for numerical values).
ESQL table shows instead the null bucket and renders it with the appropiate label.

Screenshots

BEFORE:

AFTER:

XY charts: categorical breakdown

Breaking down a chart, or using a categorical X axis now shows correctly both empty and null buckets in ESQL charts.

Screenshots

BEFORE:

AFTER:

XY charts: numerical breakdown

Breaking down a chart or using a numerical X axis doesn't have any major change in both DSL/ESQL charts.
DSL can't handle missing values, where ESQL does.

Screenshots

BEFORE:

AFTER:

Visualize breakdowns

This shows that legacy agg-based charts are rendering the two replacement labels correctly now.
The tests also evaluate the custom label that can be configured in the Visualize UI and in the XY expressions to replace the current formatted replacement labels.

Screenshots

BEFORE:

AFTER:

Histogram DSL charts

No major changes here for DSL histograms as it was already showing missing and empty values on both X and Y axis.

Screenshots

BEFORE:

AFTER:

Histogram ESQL charts

The empty label is now visible on the ESQL charts, but I wasn't able to make the missing value appear here.
With a follow up PR I will try to fix that too.

Screenshots

BEFORE:

AFTER:

Partition charts: breakdown by categorical values

ESQL charts are now aligned to the DSL ones, showing correctly both the empty and the missing buckets.

Screenshots

BEFORE:

AFTER:

Partition charts: breakdown by numerical values

Nothing has changed for DSL that doesn't show missing bucket by design. ESQL charts labels are now correctly aligned with the rest of the logics.

Screenshots

BEFORE:

AFTER:

Discover sessions (and also other parts in Discover)

Now also Discover is aligned with the same labeling as in the charts, applying also the right style to these labels.

Screenshots

BEFORE:

AFTER:

For reviewers:

The high number of deletions is due to the replacement of a full FieldFormatterFactory mock with a real FieldFormatter, causing a lot of snapshot tests to be updated with the removal of all the mocks calls.

The data used by the dashboard

POST _bulk
{ "index": { "_index": "my_new_index" } }
{ "@timestamp": "2025-07-31T01:00:00.000Z", "group": "A", "value": 10 }
{ "index": { "_index": "my_new_index" } }
{ "@timestamp": "2025-07-31T02:00:00.000Z", "group": "B", "value": 20 }
{ "index": { "_index": "my_new_index" } }
{ "@timestamp": "2025-07-31T03:00:00.000Z", "group": "", "value": 30 }
{ "index": { "_index": "my_new_index" } }
{ "@timestamp": "2025-07-31T04:00:00.000Z", "group": null, "value": 5 }
{ "index": { "_index": "my_new_index" } }
{ "@timestamp": "2025-07-31T01:30:00.000Z", "group": "A", "value": null }
{ "index": { "_index": "my_new_index" } }
{ "@timestamp": "2025-07-31T02:30:00.000Z", "group": "B", "value": null }
{ "index": { "_index": "my_new_index" } }
{ "@timestamp": "2025-07-31T03:30:00.000Z", "group": "", "value": null }
{ "index": { "_index": "my_new_index" } }
{ "@timestamp": "2025-07-31T04:30:00.000Z", "group": null, "value": null }
{ "index": { "_index": "my_new_index" } }
{ "@timestamp": "2025-07-31T01:00:00.000Z", "group": "Y", "value": 0 }
{ "index": { "_index": "my_new_index" } }
{ "@timestamp": "2025-07-31T02:00:00.000Z", "group": "Y", "value": 0 }

The NDJSON for the dashboard

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{"excludedObjects":[],"excludedObjectsCount":0,"exportedCount":3,"missingRefCount":0,"missingReferences":[]}

Release note

Null buckets and empty string values are now rendered in the UI as (missing value) and (empty) respectively. This is now aligned across charts and tables, including Discover and Lens charts.

[elasticmachine]

Pinging @elastic/kibana-visualizations (Team:Visualizations)

[stratoula]

I played with it Marco, looks really nice and I cant see any regression tbh. Only one question about the esql response change from me. Other than that it looks great

[jughosta]

Thanks for working on it, @markov00!

[jughosta]

Great work, @markov00!

Discover-related changes LGTM 👍

[jughosta]

Thanks for creating a new package!

Suggested change

	"owner": "@elastic/kibana-visualizations",
	"owner": [
	"@elastic/kibana-visualizations",
	"@elastic/kibana-data-discovery"
	],

[markov00]

Good, happy to share the ownership a1ae9aa

[jughosta]

I think we also need to update .i18nrc.json now with the following:

"fieldFormats": [
  "src/platform/plugins/shared/field_formats",
  "src/platform/packages/shared/kbn-field-formats-common"
],

[markov00]

done in a1ae9aa thank you , I didn't know about this. I hope it was automated

[pheyos]

src/platform/test/tsconfig.json and x-pack/platform/test/tsconfig.json changes LGTM

[walterra]

The PR description says

for NaN numbers -> use the term N/A

just to clarify, it makes more sense like it's here in the code, is just the PR description outdated?

[markov00]

PR description outdated, updated right now

[walterra]

Nit: There's pros/cons about asserting against the defined const and not the raw string. toEqual(EMPTY_LABEL); is easier to maintain. but toEqual('(blank)') makes the expected outcome more obvious. if EMPTY_LABEL would ever change, the assertions need updating, but it would also make it more obvious in git diffs which updates are affected. using the raw string in the assertions also would protect against accidental changes/typos in the const.

[markov00]

you are right, I can bring this back in a different PR

[walterra]

do you want to keep this commented code around or is it good to remove it?

[markov00]

20536d3

[walterra]

Nit: Typo blocks -> block.

[markov00]

20536d3

[dej611]

Tested locally 👍

Left some minor comments, but it looks good overall.

[dej611]

Shouldn't this be i18n as well?

[markov00]

No, I believe NaN is international at this point :D

[dej611]

nit:

Suggested change

	return layer.accessors.length > 0 && layer.table && layer.table.rows.length > 0;
	return layer.accessors.length > 0 && layer.table?.rows.length > 0;

[markov00]

20536d3

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: acc2b71

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
aiops	603	605	+2
apm	2011	2013	+2
charts	159	161	+2
data	507	509	+2
discover	1610	1612	+2
eventAnnotationListing	572	574	+2
expressionGauge	186	188	+2
expressionHeatmap	190	192	+2
expressionLegacyMetricVis	143	145	+2
expressionMetricVis	144	146	+2
expressionPartitionVis	217	219	+2
expressionTagcloud	179	181	+2
expressionXY	265	267	+2
fieldFormats	57	59	+2
infra	1588	1590	+2
lens	1416	1418	+2
ml	2537	2539	+2
observability	1508	1510	+2
securitySolution	8287	8289	+2
slo	1269	1271	+2
transform	796	798	+2
visDefaultEditor	227	229	+2
visTypeTimeseries	408	410	+2
visualizations	548	550	+2
total			+48

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/field-formats-common	-	4	+4

Any counts in public APIs

Total count of every any typed public API. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats any for more detailed information.

id	before	after	diff
fieldFormats	5	6	+1

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
aiops	525.2KB	525.4KB	+237.0B
apm	2.7MB	2.7MB	+237.0B
data	21.8KB	21.8KB	-5.0B
discover	1.2MB	1.2MB	+237.0B
expressionPartitionVis	37.9KB	37.8KB	-127.0B
expressionXY	100.0KB	99.6KB	-423.0B
lens	1.5MB	1.5MB	-44.0B
ml	5.4MB	5.4MB	+237.0B
securitySolution	11.1MB	11.1MB	+237.0B
slo	973.9KB	974.1KB	+237.0B
transform	623.0KB	623.3KB	+237.0B
total			+1.0KB

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
data	433.7KB	433.9KB	+206.0B
fieldFormats	57.5KB	58.0KB	+437.0B
total			+643.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/field-formats-common	-	4	+4

History

• 💔 Build #344645 failed f92991c
• 💚 Build #343699 succeeded e4b9ddc
• 💛 Build #342675 was flaky 734677b
• 💔 Build #342438 failed 791489f
• 💔 Build #342218 failed f81a619