diff --git a/api-ref/source/conf.py b/api-ref/source/conf.py
index 56f0702..3da5898 100644
--- a/api-ref/source/conf.py
+++ b/api-ref/source/conf.py
@@ -30,6 +30,17 @@ otcdocs_repo_name = 'docs/gaussdb-mysql'
 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 = '/gaussdb-mysql/api-ref/'
+otcdocs_doc_title = 'API Reference'
+otcdocs_doc_type = 'api-ref'
+otcdocs_service_category = 'database'
+otcdocs_service_title = 'GaussDB (for MySQL)'
+otcdocs_service_type = 'gaussdb_mysql'
+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 057c677..003eb2e 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
@@ -40,7 +42,7 @@ commands =
   {[testenv:json-umn]commands}
 
 [testenv:docs-pdf]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   rm
   mkdir
@@ -55,7 +57,7 @@ commands =
 
 # HTML version
 [testenv:api-ref]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -66,7 +68,7 @@ commands =
 
 # Json version (for search)
 [testenv:json-api-ref]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -81,7 +83,7 @@ commands =
 
 # PDF version
 [testenv:api-ref-pdf-docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   rm
   mkdir
@@ -100,7 +102,7 @@ commands =
 
 # HTML version
 [testenv:umn]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -111,7 +113,7 @@ commands =
 
 # Json version (for search)
 [testenv:json-umn]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -126,7 +128,7 @@ commands =
 
 # PDF version
 [testenv:umn-pdf-docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   rm
   mkdir
diff --git a/umn/source/conf.py b/umn/source/conf.py
index e1e64d6..7d350de 100644
--- a/umn/source/conf.py
+++ b/umn/source/conf.py
@@ -30,6 +30,17 @@ otcdocs_repo_name = 'docs/gaussdb-mysql'
 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 = '/gaussdb-mysql/umn/'
+otcdocs_doc_title = 'User Guide'
+otcdocs_doc_type = 'umn'
+otcdocs_service_category = 'database'
+otcdocs_service_title = 'GaussDB (for MySQL)'
+otcdocs_service_type = 'gaussdb_mysql'
+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.