diff --git a/api-ref/source/conf.py b/api-ref/source/conf.py
index be574f4..0bb3078 100644
--- a/api-ref/source/conf.py
+++ b/api-ref/source/conf.py
@@ -30,6 +30,17 @@ otcdocs_repo_name = 'docs/virtual-private-cloud'
 otcdocs_git_fqdn = 'gitea.eco.tsi-dev.otc-service.com'
 otcdocs_git_type = 'gitea'
 
+# Those variables are needed for indexing into OpenSearch
+otcdocs_doc_environment = 'internal'
+otcdocs_doc_link = '/virtual-private-cloud/api-ref/'
+otcdocs_doc_title = 'API Reference'
+otcdocs_doc_type = 'api-ref'
+otcdocs_service_category = 'network'
+otcdocs_service_title = 'Virtual Private Cloud'
+otcdocs_service_type = 'vpc'
+otcdocs_search_environment = 'hc_de'
+otcdocs_search_url = "https://opensearch.eco.tsi-dev.otc-service.com/"
+
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
diff --git a/tox.ini b/tox.ini
index 3ca208b..25415b8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,7 +24,9 @@ commands = {posargs}
 # This env is invoked in the periodic pipeline and is therefore responsible to
 # build all relevant docs at once.
 [testenv:docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps =
+  -r{toxinidir}/doc/requirements.txt
+  -c https://raw.githubusercontent.com/opentelekomcloud-docs/docs-constraints/main/constraints.txt
 allowlist_externals =
   mkdir
   cp
@@ -34,13 +36,13 @@ allowlist_externals =
 commands =
   rm -rf doc/build/html doc/build/doctrees
   sphinx-build -a -E -W -d doc/build/doctrees -b html doc/source doc/build/html
-  {[testenv:api-ref]commands}
-  {[testenv:json-api-ref]commands}
   {[testenv:umn]commands}
   {[testenv:json-umn]commands}
+  {[testenv:api-ref]commands}
+  {[testenv:json-api-ref]commands}
 
 [testenv:docs-pdf]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   rm
   mkdir
@@ -49,58 +51,13 @@ allowlist_externals =
   cp
 commands =
   mkdir -p doc/build/pdf
-  {[testenv:api-ref-pdf-docs]commands}
   {[testenv:umn-pdf-docs]commands}
-
-
-# HTML version
-[testenv:api-ref]
-deps = -r{toxinidir}/doc/requirements.txt
-allowlist_externals =
-  cp
-  mkdir
-commands =
-  sphinx-build -W --keep-going -b html api-ref/source doc/build/html/api-ref
-  mkdir -p api-ref/build/html
-  cp -av doc/build/html/api-ref api-ref/build/html
-
-# Json version (for search)
-[testenv:json-api-ref]
-deps = -r{toxinidir}/doc/requirements.txt
-allowlist_externals =
-  cp
-  mkdir
-  sh
-commands =
-  sphinx-build -W --keep-going -b json api-ref/source doc/build/json/api-ref
-  # Drop data useless for the search - wrap it also with sh/xargs due to bugs
-  # in tox
-  sh -c "find doc/build/json -type d -and '(' -name '_images' -or -name '_static' -or -name '_sources' ')' -print0 | xargs -0 rm -rf"
-  mkdir -p api-ref/build/json
-  cp -av doc/build/json/api-ref api-ref/build/json
-
-# PDF version
-[testenv:api-ref-pdf-docs]
-deps = -r{toxinidir}/doc/requirements.txt
-allowlist_externals =
-  rm
-  mkdir
-  make
-  bash
-  cp
-commands =
-  rm -rf api-ref/build/pdf
-  sphinx-build -W --keep-going -b latex api-ref/source api-ref/build/pdf/
-  bash -c "for f in api-ref/build/pdf/*.gif; do convert $f $\{f/%gif/png\}; done || true"
-  bash -c "for f in api-ref/build/pdf/*.tex; do sed -iorig 's/\.gif//g' $f; done"
-  make -C api-ref/build/pdf
-  mkdir -p doc/build/pdf
-  cp api-ref/build/pdf/vpc-api-ref.pdf doc/build/pdf/
+  {[testenv:api-ref-pdf-docs]commands}
 
 
 # HTML version
 [testenv:umn]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -111,7 +68,7 @@ commands =
 
 # Json version (for search)
 [testenv:json-umn]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -126,7 +83,7 @@ commands =
 
 # PDF version
 [testenv:umn-pdf-docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   rm
   mkdir
@@ -143,6 +100,51 @@ commands =
   cp umn/build/pdf/vpc-umn.pdf doc/build/pdf/
 
 
+# HTML version
+[testenv:api-ref]
+deps = {[testenv:docs]deps}
+allowlist_externals =
+  cp
+  mkdir
+commands =
+  sphinx-build -W --keep-going -b html api-ref/source doc/build/html/api-ref
+  mkdir -p api-ref/build/html
+  cp -av doc/build/html/api-ref api-ref/build/html
+
+# Json version (for search)
+[testenv:json-api-ref]
+deps = {[testenv:docs]deps}
+allowlist_externals =
+  cp
+  mkdir
+  sh
+commands =
+  sphinx-build -W --keep-going -b json api-ref/source doc/build/json/api-ref
+  # Drop data useless for the search - wrap it also with sh/xargs due to bugs
+  # in tox
+  sh -c "find doc/build/json -type d -and '(' -name '_images' -or -name '_static' -or -name '_sources' ')' -print0 | xargs -0 rm -rf"
+  mkdir -p api-ref/build/json
+  cp -av doc/build/json/api-ref api-ref/build/json
+
+# PDF version
+[testenv:api-ref-pdf-docs]
+deps = {[testenv:docs]deps}
+allowlist_externals =
+  rm
+  mkdir
+  make
+  bash
+  cp
+commands =
+  rm -rf api-ref/build/pdf
+  sphinx-build -W --keep-going -b latex api-ref/source api-ref/build/pdf/
+  bash -c "for f in api-ref/build/pdf/*.gif; do convert $f $\{f/%gif/png\}; done || true"
+  bash -c "for f in api-ref/build/pdf/*.tex; do sed -iorig 's/\.gif//g' $f; done"
+  make -C api-ref/build/pdf
+  mkdir -p doc/build/pdf
+  cp api-ref/build/pdf/vpc-api-ref.pdf doc/build/pdf/
+
+
 
 [doc8]
 ignore = D001
diff --git a/umn/source/conf.py b/umn/source/conf.py
index 203841c..3b8cda4 100644
--- a/umn/source/conf.py
+++ b/umn/source/conf.py
@@ -30,6 +30,17 @@ otcdocs_repo_name = 'docs/virtual-private-cloud'
 otcdocs_git_fqdn = 'gitea.eco.tsi-dev.otc-service.com'
 otcdocs_git_type = 'gitea'
 
+# Those variables are needed for indexing into OpenSearch
+otcdocs_doc_environment = 'internal'
+otcdocs_doc_link = '/virtual-private-cloud/umn/'
+otcdocs_doc_title = 'User Guide'
+otcdocs_doc_type = 'umn'
+otcdocs_service_category = 'network'
+otcdocs_service_title = 'Virtual Private Cloud'
+otcdocs_service_type = 'vpc'
+otcdocs_search_environment = 'hc_de'
+otcdocs_search_url = "https://opensearch.eco.tsi-dev.otc-service.com/"
+
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.