[CI] SemanticTextUpgradeIT testSemanticTextOperations {p0=false} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #8083 / openjdk21_8.18.2_java-fips-matrix-bwc
• elasticsearch-periodic #8083 / openjdk23_8.18.2_java-matrix-bwc
• elasticsearch-periodic #8083 / 8.18.2_bwc
• elasticsearch-pull-request #71181 / 8.18.2_bwc-snapshots
• elasticsearch-intake #22860 / 8.18.2_bwc-snapshots
• elasticsearch-intake #22859 / 8.18.2_bwc-snapshots
• elasticsearch-intake #22859 / 9.0.2_bwc-snapshots
• elasticsearch-pull-request #71166 / 8.18.2_bwc-snapshots

Reproduction Line:

./gradlew ":x-pack:qa:rolling-upgrade:v8.18.2#oldClusterTest" -Dtests.class="org.elasticsearch.upgrades.SemanticTextUpgradeIT" -Dtests.method="testSemanticTextOperations {p0=true}" -Dtests.seed=A7DDABF1758D4272 -Dtests.bwc=true -Dtests.locale=sr-Latn-ME -Dtests.timezone=America/Campo_Grande -Druntime.java=21 -Dtests.fips.enabled=true

Applicable branches:
9.0

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

org.elasticsearch.client.ResponseException: method [POST], host [http://127.0.0.1:41133], URI [semantic_text_test_index_legacy/_doc/doc_1?refresh=true], status line [HTTP/1.1 400 Bad Request]
{"error":{"root_cause":[{"type":"document_parsing_exception","reason":"[1:1652] failed to parse field [dense_field] of type [semantic_text] in document with id 'doc_1'. Preview of field's value: 'null'"}],"type":"document_parsing_exception","reason":"[1:1652] failed to parse field [dense_field] of type [semantic_text] in document with id 'doc_1'. Preview of field's value: 'null'","caused_by":{"type":"illegal_argument_exception","reason":"The [dense_vector] field [dense_field.inference.chunks.embeddings] in doc [document with id 'doc_1'] has more dimensions than defined in the mapping [128]"}},"status":400}

Issue Reasons:

• [9.0] 2 consecutive failures in test testSemanticTextOperations {p0=false}
• [9.0] 3 consecutive failures in step 8.18.2_bwc-snapshots
• [9.0] 8 failures in test testSemanticTextOperations {p0=false} (13.3% fail rate in 60 executions)
• [9.0] 4 failures in step 8.18.2_bwc-snapshots (57.1% fail rate in 7 executions)
• [9.0] 2 failures in pipeline elasticsearch-pull-request (50.0% fail rate in 4 executions)
• [9.0] 2 failures in pipeline elasticsearch-intake (66.7% fail rate in 3 executions)

Note:
This issue was created using new test triage automation. Please report issues or feedback to es-delivery.

[elasticsearchmachine]

This has been muted on branch 9.0

Mute Reasons:

• [9.0] 2 failures in test testSemanticTextOperations {p0=false} (7.7% fail rate in 26 executions)

Build Scans:

• elasticsearch-intake #22859 / 9.0.2_bwc-snapshots
• elasticsearch-pull-request #71166 / 8.18.2_bwc-snapshots

[elasticsearchmachine]

Pinging @elastic/search-eng (Team:SearchOrg)

[elasticsearchmachine]

Pinging @elastic/search-relevance (Team:Search - Relevance)

[Mikep86]

Fixed by #127940