• File size measurements show the distribution of size of files.
• Files are classified in four categories based on their size (lines of code): 1-100 (very small files), 101-200 (small files), 201-500 (medium size files), 501-1000 (long files), 1001+(very long files).
• It is a good practice to keep files small. Long files may become "bloaters", code that have increased to such gargantuan proportions that they are hard to work with.

• There are 14,651 files with 1,920,392 lines of code.
• 148 very long files (246,689 lines of code)
• 464 long files (310,916 lines of code)
• 1,902 medium size files (571,534 lines of codeclsfd_ftr_w_mp_ins)
• 2,871 small files (406,126 lines of code)
• 9,266 very small files (385,127 lines of code)

There are 8416 files with lines longer than 120 characters. In total, there are 48938 long lines.

File	# lines	# units	# long lines
verification-metadata.xml in gradle	4971	-	998
AbstractHyperLogLog.java in server/src/main/java/org/elasticsearch/search/aggregations/metrics	770	10	608
FieldLevelSecurityTests.java in x-pack/plugin/security/src/internalClusterTest/java/org/elasticsearch/integration	2145	35	204
DataStreamIT.java in modules/data-streams/src/internalClusterTest/java/org/elasticsearch/datastreams	2162	61	188
ApiKeyIntegTests.java in x-pack/plugin/security/src/internalClusterTest/java/org/elasticsearch/xpack/security/authc	3032	99	161
EsqlBaseParser.java in x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/parser	7279	726	150
BlobStoreRepository.java in server/src/main/java/org/elasticsearch/repositories/blobstore	3170	127	147
HighlighterSearchIT.java in server/src/internalClusterTest/java/org/elasticsearch/search/fetch/subphase/highlight	3265	95	146
SnapshotsService.java in server/src/main/java/org/elasticsearch/snapshots	3342	117	138
DefaultSemanticAnalysisPhase.java in modules/lang-painless/src/main/java/org/elasticsearch/painless/phase	2597	49	136
DocumentLevelSecurityTests.java in x-pack/plugin/security/src/internalClusterTest/java/org/elasticsearch/integration	1491	26	128
TokenService.java in x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authc	2301	102	122
RRFRankMultiShardIT.java in x-pack/plugin/rank-rrf/src/internalClusterTest/java/org/elasticsearch/xpack/rank/rrf	1077	20	119
PainlessParser.java in modules/lang-painless/src/main/java/org/elasticsearch/painless/antlr	5183	594	117
formatterConfig.xml in build-conventions	390	-	116
SqlBaseParser.java in x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser	8538	1006	114
IndexFollowingIT.java in x-pack/plugin/ccr/src/internalClusterTest/java/org/elasticsearch/xpack/ccr	1586	46	112
SearchModule.java in server/src/main/java/org/elasticsearch/search	1166	41	108
IndexShard.java in server/src/main/java/org/elasticsearch/index/shard	3434	239	104
FieldSortIT.java in server/src/internalClusterTest/java/org/elasticsearch/search/sort	1956	33	103
MachineLearning.java in x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml	2082	35	102
ApiKeyRestIT.java in x-pack/plugin/security/qa/security-trial/src/javaRestTest/java/org/elasticsearch/xpack/security/apikey	2199	69	101
IndexRecoveryIT.java in server/src/internalClusterTest/java/org/elasticsearch/indices/recovery	1802	45	100
ApiKeyService.java in x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authc	2385	100	99
ElasticsearchEntitlementChecker.java in libs/entitlement/src/main/java/org/elasticsearch/entitlement/runtime/api	2381	444	89
EntitlementChecker.java in libs/entitlement/bridge/src/main/java/org/elasticsearch/entitlement/bridge	754	-	84
DefaultConstantFoldingOptimizationPhase.java in modules/lang-painless/src/main/java/org/elasticsearch/painless/phase	673	13	83
ChildQuerySearchIT.java in modules/parent-join/src/internalClusterTest/java/org/elasticsearch/join/query	1564	38	83
IndexAliasesIT.java in server/src/internalClusterTest/java/org/elasticsearch/aliases	1428	36	82
PercolatorQuerySearchIT.java in modules/percolator/src/internalClusterTest/java/org/elasticsearch/percolator	1255	16	80
DataStreamAndIndexLifecycleMixingTests.java in x-pack/plugin/ilm/src/internalClusterTest/java/org/elasticsearch/xpack/ilm	721	9	77
RestIndicesAction.java in server/src/main/java/org/elasticsearch/rest/action/cat	624	9	77
ShardsAvailabilityHealthIndicatorService.java in server/src/main/java/org/elasticsearch/cluster/routing/allocation/shards	1099	38	75
DataStreamsSnapshotsIT.java in modules/data-streams/src/internalClusterTest/java/org/elasticsearch/datastreams	1290	33	75
ResultSetTestCase.java in x-pack/plugin/sql/qa/jdbc/src/main/java/org/elasticsearch/xpack/sql/qa/jdbc	2204	107	74
DenseVectorFieldMapper.java in server/src/main/java/org/elasticsearch/index/mapper/vectors	2461	202	74
DataStreamLifecycleService.java in modules/data-streams/src/main/java/org/elasticsearch/datastreams/lifecycle	1366	52	74
SearchQueryIT.java in server/src/internalClusterTest/java/org/elasticsearch/search/query	1561	59	72
InternalEngine.java in server/src/main/java/org/elasticsearch/index/engine	2848	197	72
CcrRetentionLeaseIT.java in x-pack/plugin/ccr/src/internalClusterTest/java/org/elasticsearch/xpack/ccr	1075	19	70
AutoFollowIT.java in x-pack/plugin/ccr/src/javaRestTest/java/org/elasticsearch/xpack/ccr	1078	31	68
MetadataCreateIndexService.java in server/src/main/java/org/elasticsearch/cluster/metadata	1534	50	67
IndexBasedTransformConfigManager.java in x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/persistence	877	36	66
JobResultsProvider.java in x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/persistence	1695	56	66
SharedClusterSnapshotRestoreIT.java in server/src/internalClusterTest/java/org/elasticsearch/snapshots	1942	41	66
RestoreService.java in server/src/main/java/org/elasticsearch/snapshots	1621	46	66
GeoDistanceIT.java in server/src/internalClusterTest/java/org/elasticsearch/search/sort	571	6	65
SearchableSnapshotsIntegTests.java in x-pack/plugin/searchable-snapshots/src/internalClusterTest/java/org/elasticsearch/xpack/searchablesnapshots	1105	14	64
SearchableSnapshotsCanMatchOnCoordinatorIntegTests.java in x-pack/plugin/searchable-snapshots/src/internalClusterTest/java/org/elasticsearch/xpack/searchablesnapshots	1081	17	64
TransformConfigManagerTests.java in x-pack/plugin/transform/src/internalClusterTest/java/org/elasticsearch/xpack/transform/persistence	634	14	63