[CI] MixedClusterClientYamlTestSuiteIT failure

[andreidan]

Couldn't reproduce locally.

Build scan available https://gradle-enterprise.elastic.co/s/kmdbpkvh6hcpi

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v7.5.0#mixedClusterTest' --tests "org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=search/110_field_collapsing/field collapsing and search_after}" \
  -Dtests.seed=1207F88C9F182084 \
  -Dtests.security.manager=true \
  -Dtests.locale=ln \
  -Dtests.timezone=America/Hermosillo \
  -Dcompiler.java=12 \
  -Druntime.java=11

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v7.5.0#mixedClusterTest' --tests "org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=search/110_field_collapsing/field collapsing and scroll}" \
  -Dtests.seed=1207F88C9F182084 \
  -Dtests.security.manager=true \
  -Dtests.locale=ln \
  -Dtests.timezone=America/Hermosillo \
  -Dcompiler.java=12 \
  -Druntime.java=11

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v7.5.0#mixedClusterTest' --tests "org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=search/160_exists_query/Test exists query on integer field in empty index}" \
  -Dtests.seed=1207F88C9F182084 \
  -Dtests.security.manager=true \
  -Dtests.locale=ln \
  -Dtests.timezone=America/Hermosillo \
  -Dcompiler.java=12 \
  -Druntime.java=11

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v7.5.0#mixedClusterTest' --tests "org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=search/110_field_collapsing/field collapsing on a field alias}" \
  -Dtests.seed=1207F88C9F182084 \
  -Dtests.security.manager=true \
  -Dtests.locale=ln \
  -Dtests.timezone=America/Hermosillo \
  -Dcompiler.java=12 \
  -Druntime.java=11

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v7.5.0#mixedClusterTest' --tests "org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT" \
  -Dtests.method="test {p0=indices.shrink/10_basic/Shrink index via API}" \
  -Dtests.seed=1207F88C9F182084 \
  -Dtests.security.manager=true \
  -Dtests.locale=ln \
  -Dtests.timezone=America/Hermosillo \
  -Dcompiler.java=12 \
  -Druntime.java=11

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v7.5.0#mixedClusterTest' --tests "org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=search/110_field_collapsing/field collapsing and rescore}" \
  -Dtests.seed=1207F88C9F182084 \
  -Dtests.security.manager=true \
  -Dtests.locale=ln \
  -Dtests.timezone=America/Hermosillo \
  -Dcompiler.java=12 \
  -Druntime.java=11

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v7.5.0#mixedClusterTest' --tests "org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=search/110_field_collapsing/field collapsing and search_after}" \
  -Dtests.seed=1207F88C9F182084 \
  -Dtests.security.manager=true \
  -Dtests.locale=ln \
  -Dtests.timezone=America/Hermosillo \
  -Dcompiler.java=12 \
  -Druntime.java=11

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v7.5.0#mixedClusterTest' --tests "org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=search/110_field_collapsing/field collapsing and scroll}" \
  -Dtests.seed=1207F88C9F182084 \
  -Dtests.security.manager=true \
  -Dtests.locale=ln \
  -Dtests.timezone=America/Hermosillo \
  -Dcompiler.java=12 \
  -Druntime.java=11

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v7.5.0#mixedClusterTest' --tests "org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=search/160_exists_query/Test exists query on integer field in empty index}" \
  -Dtests.seed=1207F88C9F182084 \
  -Dtests.security.manager=true \
  -Dtests.locale=ln \
  -Dtests.timezone=America/Hermosillo \
  -Dcompiler.java=12 \
  -Druntime.java=11

REPRODUCE WITH: ./gradlew ':qa:mixed-cluster:v7.5.0#mixedClusterTest' --tests "org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=search/110_field_collapsing/field collapsing on a field alias}" \
  -Dtests.seed=1207F88C9F182084 \
  -Dtests.security.manager=true \
  -Dtests.locale=ln \
  -Dtests.timezone=America/Hermosillo \
  -Dcompiler.java=12 \
  -Druntime.java=11

All of them seem to fail with

java.lang.AssertionError: Failure at [search/110_field_collapsing:195]: the error message was expected to match the provided regex but didn't
Expected: cannot use \`collapse\` in conjunction with \`search_after\`
     but: was "{root_cause=[{type=transport_serialization_exception, reason=Failed to deserialize exception response from stream

[elasticmachine]

Pinging @elastic/es-search

[jimczi]

This is fixed by #46965, sorry for the noise